| 年份 | 单位：个 |
| 2011 | 298499.00 |
| 2010 | 289585.00 |
| 2009 | 288033.00 |
| 2008 | 220418.00 |
| 2007 | 187525.00 |
| 2006 | 162383.00 |
| 2005 | 148753.00 |
| 2004 | 113145.00 |
| 2003 | 109155.00 |
| 2002 | 104087.00 |
| 2001 | 106021.00 |
| 2000 | 103749.00 |
| 1999 | 109355.00 |
| 1998 | 102572.00 |
| 1997 | 95560.00 |
| 1996 | 108256.00 |
| 1995 | 102115.00 |
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