| 年度 | 实际值 |
|---|---|
| 1992 | 28420 |
| 1993 | |
| 1994 | |
| 1995 | 29215 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 30874 |
| 2000 | 30290 |
| 2001 | 25223 |
| 2002 | 23108 |
| 2003 | 21890 |
| 2004 | 25816 |
| 2005 | 30810 |
| 2006 | 32467 |
| 2007 | 30472 |
| 2008 | 26889 |
| 2009 | 28289 |
| 2010 | 29625 |
| 2011 | 30688 |
| 2012 | 31004 |
| 2013 | 31521 |
| 2014 | 35005 |
| 2015 | 32289 |
| 2016 | 32900 |