| 年度 | 实际值 |
|---|---|
| 1992 | 15748 |
| 1993 | |
| 1994 | |
| 1995 | 22270 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 24188 |
| 2000 | 24241 |
| 2001 | 21420 |
| 2002 | 20198 |
| 2003 | 19658 |
| 2004 | 20197 |
| 2005 | 19995 |
| 2006 | 19995 |
| 2007 | 19053 |
| 2008 | 19434 |
| 2009 | 18987 |
| 2010 | 18589 |
| 2011 | 18143 |
| 2012 | 18144 |
| 2013 | 18394 |
| 2014 | 17566 |
| 2015 | 16993 |
| 2016 | 16909 |