| 年度 | 实际值 |
|---|---|
| 1978 | 503 |
| 1979 | 501 |
| 1980 | 482 |
| 1981 | 577 |
| 1982 | 867 |
| 1983 | 564 |
| 1984 | 735 |
| 1985 | 961 |
| 1986 | 1078 |
| 1987 | 1302 |
| 1988 | 1544 |
| 1989 | 1724 |
| 1990 | 2033 |
| 1991 | 2367 |
| 1992 | 2522 |
| 1993 | 3928 |
| 1994 | 5770 |
| 1995 | 6529 |
| 1996 | 7435 |
| 1997 | 8309 |
| 1998 | 9678 |
| 1999 | 10793 |
| 2000 | 12218 |
| 2001 | 15271 |
| 2002 | 17927 |
| 2003 | 19716 |
| 2004 | 25178 |
| 2005 | 25866 |
| 2006 | 20373 |
| 2007 | 22175 |
| 2008 | 26222 |
| 2009 | 28929 |
| 2010 | 33820 |
| 2011 | 37291 |
| 2012 | 41477 |
| 2013 | 45560 |
| 2014 | 50412 |
| 2015 | 52553 |