Table 02. Average Number of EMPLOYEES at Sand and
Gravel Operations in
the United States,
by Primary
Activity, 1978-2007
SURFACE MINES
|
Year
|
Strip
|
Dredge
|
Total w/o Office
|
Office
|
Grand Total
|
1978
|
34,405
|
6,164
|
40,569
|
6,043
|
46,612
|
1979
|
37,934
|
6,005
|
43,939
|
6,204
|
50,143
|
1980
|
34,639
|
5,445
|
40,084
|
6,024
|
46,108
|
1981
|
30,936
|
4,789
|
35,725
|
5,769
|
41,494
|
1982
|
24,949
|
4,157
|
29,106
|
4,942
|
34,048
|
1983 1/
|
26,138
|
4,212
|
30,350
|
5,244
|
35,594
|
1984
|
27,891
|
4,360
|
32,251
|
5,409
|
37,660
|
1985
|
29,847
|
4,398
|
34,245
|
5,812
|
40,057
|
1986
|
30,327
|
4,424
|
34,751
|
6,076
|
40,827
|
1987
|
30,562
|
4,667
|
35,229
|
7,115
|
42,344
|
1988
|
30,767
|
4,738
|
35,505
|
6,751
|
42,256
|
1989
|
30,894
|
4,706
|
35,600
|
7,145
|
42,745
|
1990
|
31,048
|
4,851
|
35,899
|
7,369
|
43,268
|
1991
|
29,405
|
4,930
|
34,335
|
7,221
|
41,556
|
1992
|
28,748
|
4,653
|
33,401
|
7,317
|
40,718
|
1993
|
28,170
|
4,697
|
32,867
|
7,148
|
40,015
|
1994
|
29,530
|
4,849
|
34,379
|
7,337
|
41,716
|
1995
|
28,301
|
4,669
|
32,970
|
7,016
|
39,986
|
1996
|
28,643
|
4,509
|
33,152
|
6,814
|
39,966
|
1997
|
29,406
|
4,466
|
33,872
|
6,926
|
40,798
|
1998
|
31,121
|
4,545
|
35,666
|
7,080
|
42,746
|
1999
|
32,581
|
4,713
|
37,294
|
7,567
|
44,861
|
2000
|
33,185
|
4,652
|
37,837
|
7,398
|
45,235
|
2001
|
33,000
|
4,508
|
37,508
|
7,405
|
44,913
|
2002
|
32,578
|
4,477
|
37,055
|
7,196
|
44,251
|
2003
|
31,993
|
4,547
|
36,540
|
7,370
|
43,910
|
2004
|
31,970
|
5,030
|
37,000
|
7,467
|
44,467
|
2005
|
32,615
|
5,090
|
37,705
|
7,535
|
45,240
|
2006
|
33,320
|
5,130
|
38,450
|
7,619
|
46,069
|
2007
|
33,235
|
4,947
|
38,182
|
7,579
|
45,761
|
1/ Beginning in 1983, only operator data
are available at this level of detail
|