| 年度 | 实际值 |
|---|---|
| 1980 | 163 |
| 1981 | 223 |
| 1982 | 286 |
| 1983 | 262 |
| 1984 | 293 |
| 1985 | 360 |
| 1986 | 384 |
| 1987 | 529 |
| 1988 | 784 |
| 1989 | 719 |
| 1990 | 619 |
| 1991 | 764 |
| 1992 | 801 |
| 1993 | 1035 |
| 1994 | 1540 |
| 1995 | 1798 |
| 1996 | 2616 |
| 1997 | 2747 |
| 1998 | 2833 |
| 1999 | 3020 |
| 2000 | 3128 |
| 2001 | 3716 |
| 2002 | 4038 |
| 2003 | 4081 |
| 2004 | 4335 |
| 2005 | 4751 |
| 2006 | 5218 |
| 2007 | 6140 |
| 2008 | 6962 |
| 2009 | 7621 |
| 2010 | 8756 |
| 2011 | 10365 |
| 2012 | 11549 |
| 2013 | 12704 |
| 2014 | 15404 |
| 2015 | 16938 |