Occupational Employment Statistics

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1999 National Industry-Specific Occupational Employment and Wage Estimates

SIC 171 - Plumbing, Heating and Air-Conditioning

These national industry-specific occupational employment and wage estimates are calculated with data collected from employers of all sizes, in metropolitan and non-metropolitan areas in every State and the District of Columbia, in SIC Industry Group 171 - Plumbing, Heating and Air-Conditioning.

SIC Industry Group 171 - Plumbing, Heating and Air-Conditioning is part of: SIC Major Group 17 - Construction Special Trade Contractors.

Links to other industry-specific estimates and cross-industry estimates

SOC Major Groups in in SIC 171 - Plumbing, Heating and Air-Conditioning:

Industry Total
Management Occupations
Business and Financial Operations Occupations
Computer and Mathematical Occupations
Architecture and Engineering Occupations
Life, Physical, and Social Science Occupations
Arts, Design, Entertainment, Sports, and Media Occupations
Healthcare Practitioners and Technical Occupations
Building and Grounds Cleaning and Maintenance Occupations
Sales and Related Occupations
Office and Administrative Support Occupations
Construction and Extraction Occupations
Installation, Maintenance, and Repair Occupations
Production Occupations
Transportation and Material Moving Occupations

SIC 171 - Plumbing, Heating and Air-Conditioning

Click on the SOC code number to view that occupation's definition and national cross-industry estimates.

Industry Total top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
00-0000	Industry Total	906,450	100.00%	$15.44	$17.52	$36,450	0.8 %

Management Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
11-0000	Management Occupations	60,580	6.68%	$27.98	$31.90	$66,350	1.2 %
11-1011	Chief Executives	5,070	0.56%	$50.87	$48.82	$101,540	0.0 %
11-1021	General and Operations Managers	25,930	2.86%	$29.60	$32.66	$67,920	0.0 %
11-2021	Marketing Managers	370	0.04%	$26.72	$31.18	$64,860	0.0 %
11-2022	Sales Managers	1,290	0.14%	$28.03	$29.65	$61,680	0.0 %
11-2031	Public Relations Managers	(5)	(5)	$16.10	$20.04	$41,680	0.0 %
11-3011	Administrative Services Managers	1,380	0.15%	$20.21	$24.53	$51,030	0.0 %
11-3031	Financial Managers	5,190	0.57%	$23.76	$26.55	$55,220	0.0 %
11-3040	Human Resources Managers (3)	550	0.06%	$21.05	$22.99	$47,810	3.0 %
11-3051	Industrial Production Managers (3)	(5)	(5)	$32.29	$31.02	$64,530	4.5 %
11-3061	Purchasing Managers (3)	760	0.08%	$20.94	$23.05	$47,950	2.7 %
11-3071	Transportation, Storage, and Distribution Managers	180	0.02%	$21.62	$23.65	$49,190	0.0 %
11-9021	Construction Managers	17,420	1.92%	$26.50	$29.63	$61,630	0.0 %
11-9041	Engineering Managers	1,050	0.12%	$28.94	$31.05	$64,580	0.0 %

Business and Financial Operations Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
13-0000	Business and Financial Operations Occupations	19,540	2.16%	$21.50	$23.01	$47,860	2.0 %
13-1023	Purchasing Agents, Except Wholesale, Retail, and Farm Products (3)	1,530	0.17%	$17.02	$18.32	$38,100	1.6 %
13-1041	Compliance Officers, Except Agriculture, Construction, Health and Safety, and Transportation	(5)	(5)	$17.52	$19.20	$39,930	0.0 %
13-1051	Cost Estimators (3)	15,000	1.65%	$21.45	$22.87	$47,570	0.9 %
13-1071	Employment, Recruitment, and Placement Specialists	110	0.01%	$19.08	$18.86	$39,230	0.0 %
13-2011	Accountants and Auditors (3)	2,420	0.27%	$19.40	$22.00	$45,750	5.1 %

Computer and Mathematical Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
15-0000	Computer and Mathematical Occupations	1,170	0.13%	$20.69	$22.35	$46,490	3.9 %
15-1021	Computer Programmers (3)	220	0.02%	$21.62	$22.51	$46,830	3.2 %
15-1041	Computer Support Specialists	400	0.04%	$22.98	$24.21	$50,350	0.0 %
15-1061	Database Administrators (3)	70	0.01%	$22.33	$23.07	$47,990	5.5 %
15-1071	Network and Computer Systems Administrators	310	0.03%	$20.19	$22.66	$47,130	0.0 %

Architecture and Engineering Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
17-0000	Architecture and Engineering Occupations	11,010	1.21%	$20.74	$22.30	$46,380	2.9 %
17-1011	Architects, Except Landscape and Naval (3)	210	0.02%	$24.79	$23.73	$49,350	5.7 %
17-2051	Civil Engineers (3)	1,120	0.12%	$22.76	$23.65	$49,180	3.1 %
17-2071	Electrical Engineers	660	0.07%	$27.95	$25.87	$53,800	0.0 %
17-2081	Environmental Engineers	(5)	(5)	$26.07	$27.62	$57,450	0.0 %
17-2111	Health and Safety Engineers, Except Mining Safety Engineers and Inspectors	310	0.03%	$20.55	$22.70	$47,220	0.0 %
17-2112	Industrial Engineers	160	0.02%	$23.64	$28.29	$58,840	0.0 %
17-2141	Mechanical Engineers (3)	2,190	0.24%	$28.04	$28.55	$59,380	2.8 %
17-3011	Architectural and Civil Drafters	1,600	0.18%	$16.74	$18.42	$38,320	0.0 %
17-3012	Electrical and Electronics Drafters	550	0.06%	$14.77	$15.77	$32,810	0.0 %
17-3013	Mechanical Drafters	140	0.02%	$17.82	$18.90	$39,310	0.0 %
17-3022	Civil Engineering Technicians (3)	110	0.01%	$17.16	$17.90	$37,230	3.2 %
17-3023	Electrical and Electronic Engineering Technicians	230	0.03%	$19.01	$18.83	$39,160	0.0 %
17-3026	Industrial Engineering Technicians (3)	320	0.04%	$17.63	$17.31	$36,000	2.0 %
17-3027	Mechanical Engineering Technicians	780	0.09%	$19.24	$20.67	$42,990	0.0 %
17-3031	Surveying and Mapping Technicians (3)	(5)	(5)	$11.42	$15.44	$32,120	10.6 %

Life, Physical, and Social Science Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
19-0000	Life, Physical, and Social Science Occupations	(5)	(5)	$9.95	$13.93	$28,960	25.9 %

Arts, Design, Entertainment, Sports, and Media Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
27-0000	Arts, Design, Entertainment, Sports, and Media Occupations	350	0.04%	$17.15	$18.29	$38,040	4.8 %
27-1021	Commercial and Industrial Designers	210	0.02%	$19.73	$20.12	$41,860	0.0 %
27-3031	Public Relations Specialists (3)	30	0.00%	$11.95	$13.45	$27,970	6.9 %

Healthcare Practitioners and Technical Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
29-0000	Healthcare Practitioners and Technical Occupations	(5)	(5)	(5)	(5)	(5)	(5)
29-9010	Occupational Health and Safety Specialists and Technicians	30	0.00%	$18.47	$18.58	$38,650	0.0 %

Building and Grounds Cleaning and Maintenance Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
37-0000	Building and Grounds Cleaning and Maintenance Occupations	9,320	1.03%	$9.66	$10.42	$21,670	3.7 %
37-1012	First-Line Supervisors/Managers of Landscaping, Lawn Service, and Groundskeeping Workers	650	0.07%	$18.11	$17.59	$36,580	0.0 %
37-2011	Janitors and Cleaners, Except Maids and Housekeeping Cleaners (3)	870	0.10%	$7.25	$7.75	$16,120	2.5 %
37-2012	Maids and Housekeeping Cleaners (3)	(5)	(5)	$6.75	$7.89	$16,420	3.0 %
37-3011	Landscaping and Groundskeeping Workers	7,480	0.83%	$9.66	$10.15	$21,120	0.0 %

Sales and Related Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
41-0000	Sales and Related Occupations	15,100	1.67%	$20.22	$22.13	$46,040	2.7 %
41-1011	First-Line Supervisors/Managers of Retail Sales Workers	230	0.03%	$36.62	$31.72	$65,970	0.0 %
41-1012	First-Line Supervisors/Managers of Non-Retail Sales Workers	350	0.04%	$34.44	$32.07	$66,710	0.0 %
41-2022	Parts Salespersons (3)	150	0.02%	$14.36	$15.70	$32,660	8.3 %
41-2031	Retail Salespersons (3)	570	0.06%	$10.31	$12.85	$26,720	10.1 %
41-4011	Sales Representatives, Wholesale and Manufacturing, Technical and Scientific Products (3)	190	0.02%	$19.18	$21.61	$44,950	4.6 %
41-4012	Sales Representatives, Wholesale and Manufacturing, Except Technical and Scientific Products (3)	9,790	1.08%	$18.31	$20.32	$42,270	2.3 %
41-9011	Demonstrators and Product Promoters (3)	(5)	(5)	$21.60	$22.57	$46,950	11.3 %
41-9031	Sales Engineers (3)	1,420	0.16%	$24.34	$27.26	$56,690	2.4 %
41-9041	Telemarketers	160	0.02%	$7.25	$7.34	$15,270	0.0 %

Office and Administrative Support Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
43-0000	Office and Administrative Support Occupations	93,280	10.29%	$11.08	$11.92	$24,800	0.9 %
43-1011	First-Line Supervisors/Managers of Office and Administrative Support Workers (3)	8,670	0.96%	$13.98	$15.39	$32,010	2.1 %
43-2011	Switchboard Operators, Including Answering Service (3)	1,150	0.13%	$9.92	$10.15	$21,110	1.6 %
43-3011	Bill and Account Collectors (3)	880	0.10%	$12.89	$13.34	$27,740	1.5 %
43-3021	Billing and Posting Clerks and Machine Operators (3)	1,990	0.22%	$11.52	$11.92	$24,790	1.6 %
43-3031	Bookkeeping, Accounting, and Auditing Clerks (3)	19,880	2.19%	$11.53	$12.24	$25,460	1.0 %
43-3051	Payroll and Timekeeping Clerks (3)	4,440	0.49%	$12.27	$12.40	$25,800	1.3 %
43-3061	Procurement Clerks (3)	360	0.04%	$12.59	$14.30	$29,740	3.2 %
43-4041	Credit Authorizers, Checkers, and Clerks	40	0.00%	$11.33	$11.22	$23,340	0.0 %
43-4051	Customer Service Representatives	830	0.09%	$10.14	$10.71	$22,280	0.0 %
43-4071	File Clerks (3)	850	0.09%	$8.53	$8.76	$18,230	3.6 %
43-4151	Order Clerks	720	0.08%	$10.66	$11.48	$23,880	0.0 %
43-4161	Human Resources Assistants, Except Payroll and Timekeeping (3)	320	0.04%	$10.86	$11.88	$24,700	2.7 %
43-4171	Receptionists and Information Clerks (3)	2,530	0.28%	$8.57	$8.81	$18,330	2.3 %
43-5021	Couriers and Messengers (3)	440	0.05%	$8.55	$9.60	$19,960	7.1 %
43-5032	Dispatchers, Except Police, Fire, and Ambulance (3)	3,250	0.36%	$12.27	$13.21	$27,480	1.5 %
43-5061	Production, Planning, and Expediting Clerks (3)	580	0.06%	$13.78	$14.31	$29,760	2.7 %
43-5071	Shipping, Receiving, and Traffic Clerks (3)	1,170	0.13%	$11.79	$12.36	$25,700	1.5 %
43-5081	Stock Clerks and Order Fillers (3)	2,790	0.31%	$10.14	$10.77	$22,390	1.0 %
43-6011	Executive Secretaries and Administrative Assistants	9,160	1.01%	$12.18	$12.93	$26,890	0.0 %
43-6014	Secretaries, Except Legal, Medical, and Executive	21,190	2.34%	$9.90	$10.26	$21,340	0.0 %
43-9011	Computer Operators (3)	180	0.02%	$13.99	$13.19	$27,440	6.3 %
43-9021	Data Entry Keyers (3)	160	0.02%	$10.56	$10.77	$22,400	3.5 %
43-9061	Office Clerks, General	10,660	1.18%	$9.79	$10.33	$21,480	0.0 %

Construction and Extraction Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
47-0000	Construction and Extraction Occupations	543,110	59.92%	$15.74	$17.22	$35,810	1.0 %
47-1011	First-Line Supervisors/Managers of Construction Trades and Extraction Workers	26,270	2.90%	$21.55	$24.05	$50,020	0.0 %
47-2011	Boilermakers (3)	3,450	0.38%	$23.41	$22.25	$46,280	5.6 %
47-2021	Brickmasons and Blockmasons	(5)	(5)	$19.34	$20.92	$43,500	0.0 %
47-2031	Carpenters	3,220	0.36%	$15.39	$16.42	$34,160	0.0 %
47-2051	Cement Masons and Concrete Finishers	(5)	(5)	$14.10	$14.09	$29,310	0.0 %
47-2061	Construction Laborers	16,690	1.84%	$10.15	$11.42	$23,750	0.0 %
47-2073	Operating Engineers and Other Construction Equipment Operators (3)	4,010	0.44%	$17.86	$18.56	$38,600	2.6 %
47-2081	Drywall and Ceiling Tile Installers	220	0.02%	$16.70	$16.77	$34,880	0.0 %
47-2111	Electricians	10,580	1.17%	$15.80	$17.21	$35,800	0.0 %
47-2121	Glaziers	(5)	(5)	$16.09	$17.05	$35,460	0.0 %
47-2130	Insulation Workers (3)	3,120	0.34%	$13.66	$15.94	$33,150	8.3 %
47-2141	Painters, Construction and Maintenance	530	0.06%	$12.98	$13.23	$27,510	0.0 %
47-2151	Pipelayers (3)	7,580	0.84%	$13.31	$14.50	$30,150	3.5 %
47-2152	Plumbers, Pipefitters, and Steamfitters (3)	274,860	30.32%	$17.37	$18.88	$39,270	0.7 %
47-2161	Plasterers and Stucco Masons (3)	1,300	0.14%	$15.48	$18.54	$38,560	15.3 %
47-2171	Reinforcing Iron and Rebar Workers (3)	(5)	(5)	$18.49	$18.69	$38,870	7.0 %
47-2181	Roofers (3)	1,280	0.14%	$14.09	$15.31	$31,840	4.1 %
47-2211	Sheet Metal Workers (3)	109,240	12.05%	$15.19	$17.30	$35,990	1.2 %
47-2221	Structural Iron and Steel Workers (3)	1,100	0.12%	$19.65	$19.38	$40,320	3.1 %
47-3011	Helpers—Brickmasons, Blockmasons, Stonemasons, and Tile and Marble Setters (3)	130	0.01%	$9.58	$10.97	$22,810	12.3 %
47-3012	Helpers—Carpenters (3)	640	0.07%	$10.09	$10.64	$22,130	2.7 %
47-3013	Helpers—Electricians	2,680	0.30%	$8.98	$9.19	$19,110	0.0 %
47-3014	Helpers—Painters, Paperhangers, Plasterers, and Stucco Masons (3)	420	0.05%	$11.26	$12.92	$26,870	8.1 %
47-3015	Helpers—Pipelayers, Plumbers, Pipefitters, and Steamfitters (3)	65,050	7.18%	$9.57	$10.14	$21,090	0.9 %
47-3016	Helpers—Roofers (3)	320	0.04%	$7.73	$8.06	$16,770	5.3 %
47-4011	Construction and Building Inspectors (3)	380	0.04%	$20.60	$18.01	$37,450	7.5 %
47-4041	Hazardous Materials Removal Workers (3)	260	0.03%	$12.08	$12.71	$26,440	5.7 %
47-4071	Septic Tank Servicers and Sewer Pipe Cleaners (3)	(5)	(5)	$11.92	$12.56	$26,130	2.1 %
47-5021	Earth Drillers, Except Oil and Gas (3)	70	0.01%	$11.09	$12.10	$25,160	5.2 %

Installation, Maintenance, and Repair Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
49-0000	Installation, Maintenance, and Repair Occupations	125,730	13.87%	$14.53	$15.54	$32,330	1.5 %
49-1011	First-Line Supervisors/Managers of Mechanics, Installers, and Repairers	4,460	0.49%	$20.12	$22.73	$47,280	0.0 %
49-2092	Electric Motor, Power Tool, and Related Repairers	30	0.00%	$15.07	$14.86	$30,900	0.0 %
49-2094	Electrical and Electronics Repairers, Commercial and Industrial Equipment	710	0.08%	$15.81	$16.23	$33,760	0.0 %
49-2098	Security and Fire Alarm Systems Installers	3,440	0.38%	$14.61	$15.97	$33,220	0.0 %
49-3023	Automotive Service Technicians and Mechanics (3)	590	0.07%	$14.03	$14.62	$30,410	2.2 %
49-3031	Bus and Truck Mechanics and Diesel Engine Specialists (3)	(5)	(5)	$14.75	$15.24	$31,700	6.9 %
49-3042	Mobile Heavy Equipment Mechanics, Except Engines (3)	110	0.01%	$17.05	$17.53	$36,460	3.6 %
49-9012	Control and Valve Installers and Repairers, Except Mechanical Door	340	0.04%	$11.94	$13.34	$27,740	0.0 %
49-9021	Heating, Air Conditioning, and Refrigeration Mechanics and Installers (3)	83,070	9.16%	$13.75	$14.91	$31,010	0.7 %
49-9031	Home Appliance Repairers	570	0.06%	$14.41	$15.61	$32,460	0.0 %
49-9041	Industrial Machinery Mechanics	(5)	(5)	$15.12	$17.16	$35,690	0.0 %
49-9042	Maintenance and Repair Workers, General (3)	13,940	1.54%	$13.92	$14.83	$30,850	2.1 %
49-9043	Maintenance Workers, Machinery (3)	60	0.01%	$12.07	$12.99	$27,020	4.7 %
49-9044	Millwrights (3)	3,680	0.41%	$16.11	$16.52	$34,360	1.9 %
49-9045	Refractory Materials Repairers, Except Brickmasons (3)	160	0.02%	$13.46	$18.63	$38,750	16.2 %
49-9051	Electrical Power-Line Installers and Repairers (3)	250	0.03%	$13.11	$13.48	$28,040	2.9 %
49-9096	Riggers (3)	90	0.01%	$17.12	$17.03	$35,430	4.3 %
49-9098	Helpers—Installation, Maintenance, and Repair Workers (3)	10,360	1.14%	$8.79	$9.26	$19,260	2.0 %

Production Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
51-0000	Production Occupations	13,390	1.48%	$14.56	$15.09	$31,390	2.5 %
51-1011	First-Line Supervisors/Managers of Production and Operating Workers	690	0.08%	$19.73	$20.36	$42,350	0.0 %
51-2041	Structural Metal Fabricators and Fitters	4,420	0.49%	$12.62	$13.42	$27,920	0.0 %
51-2092	Team Assemblers	400	0.04%	$10.37	$10.84	$22,560	0.0 %
51-4041	Machinists	190	0.02%	$15.29	$19.22	$39,980	0.0 %
51-4121	Welders, Cutters, Solderers, and Brazers (3)	5,650	0.62%	$15.11	$15.74	$32,730	1.4 %
51-4122	Welding, Soldering, and Brazing Machine Setters, Operators, and Tenders (3)	(5)	(5)	$19.75	$20.02	$41,640	9.6 %
51-9061	Inspectors, Testers, Sorters, Samplers, and Weighers (3)	200	0.02%	$13.19	$14.35	$29,850	3.9 %
51-9198	Helpers—Production Workers	690	0.08%	$9.20	$9.69	$20,150	0.0 %

Transportation and Material Moving Occupations top
		Employment Estimates		Wage Estimates
SOC Code Number	Occupation Title	Employment	Percent of Total	Median Hourly	Mean Hourly	Mean Annual (1)	Mean RSE
53-0000	Transportation and Material Moving Occupations	13,690	1.51%	$11.46	$12.50	$26,010	2.1 %
53-1021	First-Line Supervisors/Managers of Helpers, Laborers, and Material Movers, Hand	330	0.04%	$18.60	$18.74	$38,980	0.0 %
53-1031	First-Line Supervisors/Managers of Transportation and Material-Moving Machine and Vehicle Operators	(5)	(5)	$12.37	$12.98	$27,010	0.0 %
53-3032	Truck Drivers, Heavy and Tractor-Trailer	1,600	0.18%	$12.42	$13.56	$28,200	0.0 %
53-3033	Truck Drivers, Light Or Delivery Services	5,150	0.57%	$10.23	$10.99	$22,860	0.0 %
53-7021	Crane and Tower Operators (3)	310	0.03%	$16.93	$17.58	$36,560	3.6 %
53-7032	Excavating and Loading Machine and Dragline Operators (3)	1,280	0.14%	$13.75	$14.83	$30,840	3.0 %
53-7041	Hoist and Winch Operators (3)	50	0.01%	$11.24	$11.36	$23,630	4.7 %
53-7051	Industrial Truck and Tractor Operators (3)	260	0.03%	$12.47	$14.22	$29,570	5.7 %
53-7061	Cleaners of Vehicles and Equipment (3)	70	0.01%	$10.78	$11.87	$24,700	5.3 %
53-7062	Laborers and Freight, Stock, and Material Movers, Hand	3,870	0.43%	$11.17	$12.68	$26,360	0.0 %
53-7072	Pump Operators, Except Wellhead Pumpers (3)	350	0.04%	$11.28	$11.44	$23,800	4.5 %

About 1999 National Industry-Specific Occupational Employment and Wage Estimates

Estimates for residual, "All Other", occupations are not available.

(1) Annual wages have been calculated by multiplying the hourly mean wage by a "year-round, full-time" hours figure of 2,080 hours; for those occupations where there is not an hourly mean wage published, the annual wage has been directly calculated from the reported survey data.

(3) = Wage rates are calculated using three years of data: 1997, 1998, and 1999.

(5) = Estimates not released due to high relative standard error.

The relative standard error (RSE) is a measure of the reliability of a survey statistic. The smaller the relative standard error, the more precise the estimate.

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Industry-Specific occupational employment and wage estimates for other SIC groups:

SIC 17 - Construction Special Trade Contractors