| 年份 | 企业数量 | 增长率(%) | 从业人员数 | 增长率(%) |
| 2001 | 269 | - | 46,387 | - |
| 2002 | 245 | −8.92193 | 30,741 | −33.7293 |
| 2003 | 231 | −5.71429 | 48,266 | 57.00856 |
| 2004 | 197 | −14.7186 | 45,914 | −4.873 |
| 2005 | 162 | −17.7665 | 43,562 | −5.12262 |
| 2006 | 161 | −0.61728 | 50,295 | 15.45613 |
| 2007 | 153 | −4.96894 | 34,605 | −31.1959 |
| 2008 | 157 | 2.614379 | 31,601 | −8.68083 |
| 2009 | 157 | 0 | 30711 | −2.81637 |
| 2010 | 154 | −1.91083 | 31,151 | 1.432711 |
| 2011 | 159 | 3.246753 | 29,076 | −6.6611 |
| 2012 | 139 | −12.5786 | 28,033 | −3.58715 |
| 2013 | 119 | −14.3885 | 26,990 | −3.72061 |
| 2014 | 124 | 4.201681 | 28,371 | 5.11671 |
| 2015 | 117 | −5.64516 | 22,991 | −18.963 |
| 2016 | 119 | 1.709402 | 18,994 | −17.3851 |
| 2017 | 111 | −6.72269 | 19,877 | 4.648836 |