| 年度 | 实际值 |
|---|---|
| 1978 | 2184 |
| 1979 | 2182 |
| 1980 | 4853 |
| 1981 | 3844 |
| 1982 | 3794 |
| 1983 | 3263 |
| 1984 | 3354 |
| 1985 | 3208 |
| 1986 | 4166 |
| 1987 | 4042 |
| 1988 | 4661 |
| 1989 | 4967 |
| 1990 | 5302 |
| 1991 | 5607 |
| 1992 | 5677 |
| 1993 | 5228 |
| 1994 | 5110 |
| 1995 | 5359 |
| 1996 | 5464 |
| 1997 | 6094 |
| 1998 | 5441 |
| 1999 | 5562 |
| 2000 | 5501 |
| 2001 | 5499 |
| 2002 | 5278 |
| 2003 | 5651 |
| 2004 | 6516 |
| 2005 | 6724 |
| 2006 | 6192 |
| 2007 | 6257 |
| 2008 | 7185 |
| 2009 | 7430 |
| 2010 | 7891 |
| 2011 | 6839 |
| 2012 | 6455 |
| 2013 | 4117 |
| 2014 | 1251 |
| 2015 | 1167 |