| Attributes by Data Reference Year |
1991 |
1994 |
1998 |
2002 |
2006 |
| Frequency of Survey |
Every 3 years |
Every 3 years |
Every 4 years |
Every 4 years |
Every 4 years |
| Sample Size |
16,054 |
22,922 |
17,877 |
15,500 |
15,500 |
| Industry Classification Scheme |
Standard Industrial Classification System ( SIC) |
SIC |
North American Industry Classification System ( NAICS) overlapping with SIC system |
NAICS |
NAICS |
Number of Industries Published in Data Tables |
SIC
20 2-digit major groups
42 3- and 4-digit industries |
SIC
20 2-digit major groups
52 3- and 4-digit industries |
NAICS
21 3-digit industry subsectors
36 4- and 6-digit industries SIC overlapping with NAICS 20 2-digit |
NAICS
21 3-digit industry subsectors
48 4- and 6-digit industries |
NAICS
21 3-digit industry subsectors 58 4- and 6-digit industries |
| Data Collection Mode |
Mail Questionnaire |
Mail Questionnaire |
Mail Questionnaire |
Mail Questionnaire |
Web Based Questionnaire |
| Industry Classification Scheme |
Standard Industrial Classification System (SIC) |
SIC |
North American Industry Classification System (NAICS) overlapping with SIC system
major groups 10 4-digit industries
|
NAICS |
NAICS |
| Attributes by Data Reference Year |
1991 |
1994 |
1998 |
2002 |
2006 |
| Questionnaire Content |
|
|
|
|
|
| Consumption (combustible and noncombustible) |
Ongoing |
Ongoing |
Ongoing |
Ongoing |
Ongoing |
| Natural Gas Purchases and Expenditures |
-- |
Substantial increase, new section |
Reduced |
Ongoing |
Ongoing |
| End-use Allocation |
New |
Ongoing |
Ongoing |
Ongoing |
Ongoing |
| Square Footage |
New Categorical answer |
Changed to actual square footage |
Actual |
Actual |
Actual |
| Energy Management Activities |
New |
Ongoing |
Changed emphasis |
Ongoing |
Ongoing |
| Technologies – General |
New |
Ongoing |
Ongoing |
Ongoing |
Ongoing |
| Technologies – Industry-specific |
New |
Ongoing |
Ongoing |
Dropped |
-- |
| Technologies – Cogeneration |
-- |
New |
Ongoing |
Ongoing |
Ongoing |
| Fuel Switching Capability |
Ongoing |
Ongoing |
Dropped |
Restored |
Ongoing |
| Fuel Switching |
-- |
New |
Dropped |
-- |
Restored |
| Practices |
|
Between residual Fuel Oil and Natural Gas |
|
|
|
| Electric Motor Purchasing Practice |
-- |
New |
Dropped |
-- |
-- |
| Number of onsite Buildings |
-- |
-- |
New |
Ongoing |
Ongoing |