| 企业单位数（个） |
| 1990 |
| 1991 |
| 1992 |
| 1993 |
| 1994 |
| 1995 |
| 1996 |
| 1997 |
| 1998 |
| 1999 |
| 2000 |
| 2001 |
| 2002 |
| 2003 | |
|
|
|
|
| 2550 |
109 |
2441 |
|
| 2503 |
120 |
2383 |
|
| 2450 |
112 |
2314 |
24 |
| 2901 |
160 |
2721 |
20 |
| 3538 |
215 |
3273 |
50 |
| 3549 |
218 |
3216 |
115 |
| 3691 |
354 |
2671 |
666 |
| 3937 |
399 |
2569 |
969 |
| 3540 |
341 |
1572 |
1627 |
| 3657 |
330 |
1333 |
1994 |
| 3592 |
283 |
971 |
3238 |
| 3370 |
200 |
575 |
2595 |
| 3210 |
155 |
254 |
2801 |
| 3514 |
156 |
227 |
3131 | |
