Employment and Wages for SIC Code 1220 (Bituminous Coal and Lignite Mining)
| Number of Establishments | Average Employment | Average Weekly Wage | |
| 2001 | 141 | 5,513 | 966 |
| 2000 | 147 | 5,361 | 893 |
| 1999 | 156 | 5,517 | 856 |
| 1998 | 166 | 6,216 | 826 |
| 1997 | 183 | 7,156 | 794 |
| 1996 | 184 | 6,864 | 794 |
| 1995 | 195 | 7,587 | 773 |
| 1994 | 222 | 8,405 | 760 |
| 1993 | 229 | 9,382 | 708 |
| 1992 | 233 | 9,902 | 729 |
| 1991 | 254 | 10,276 | 685 |
| 1990 | 283 | 11,218 | 656 |