| 年度 | 实际值 |
|---|---|
| 1978 | 7133 |
| 1979 | 7829 |
| 1980 | 9436 |
| 1981 | 9101 |
| 1982 | 8944 |
| 1983 | 10122 |
| 1984 | 11102 |
| 1985 | 10912 |
| 1986 | 11383 |
| 1987 | 11857 |
| 1988 | 12222 |
| 1989 | 12142 |
| 1990 | 13004 |
| 1991 | 12711 |
| 1992 | 12289 |
| 1993 | 11160 |
| 1994 | 11848 |
| 1995 | 12890 |
| 1996 | 13065 |
| 1997 | 13597 |
| 1998 | 9935 |
| 1999 | 11523 |
| 2000 | 12915 |
| 2001 | 14392 |
| 2002 | 14056 |
| 2003 | 15732 |
| 2004 | 14555 |
| 2005 | 13952 |
| 2006 | 11557 |
| 2007 | 12975 |
| 2008 | 15331 |
| 2009 | 15311 |
| 2010 | 18626 |
| 2011 | 17876 |
| 2012 | 17026 |
| 2013 | 15362 |
| 2014 | 15582 |
| 2015 | 16115 |