| 年份 | 单位：个 |
| 2011 | 471376.00 |
| 2010 | 463608.00 |
| 2009 | 451262.00 |
| 2008 | 359213.00 |
| 2007 | 326204.00 |
| 2006 | 283920.00 |
| 2005 | 261535.00 |
| 2004 | 215440.00 |
| 2003 | 203215.00 |
| 2002 | 181363.00 |
| 2001 | 173950.00 |
| 2000 | 170430.00 |
| 1999 | 175253.00 |
| 1998 | 172011.00 |
| 1997 | 156865.00 |
| 1996 | 176487.00 |
| 1995 | 169163.00 |
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