| 年度 | 实际值 |
|---|---|
| 1993 | 21634 |
| 1994 | 22710 |
| 1995 | 21964 |
| 1996 | 21299 |
| 1997 | 20985 |
| 1998 | 20449 |
| 1999 | 20490 |
| 2000 | 20656 |
| 2001 | 20772 |
| 2002 | 18290 |
| 2003 | 18678 |
| 2004 | 18122 |
| 2005 | 19255 |
| 2006 | 18394 |
| 2007 | 19700 |
| 2008 | 19643 |
| 2009 | |
| 2010 | 20859 |
| 2011 | 22002 |
| 2012 | 22699 |
| 2013 | 23392 |
| 2014 | 23815 |
| 2015 | 24797 |
| 2016 | 26504 |
| 2017 | 28193 |
| 2018 | 30126 |