| 年度 | 实际值 |
|---|---|
| 1992 | 39.2 |
| 1993 | |
| 1994 | |
| 1995 | 39.2 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 27.1671 |
| 2000 | 25.37 |
| 2001 | 43.2876 |
| 2002 | 43.222 |
| 2003 | 43.8088 |
| 2004 | 43.9356 |
| 2005 | 43.9614 |
| 2006 | 44.5411 |
| 2007 | 44.5713 |
| 2008 | 45.3065 |
| 2009 | 46.0395 |
| 2010 | 46.3342 |
| 2011 | 46.3401 |
| 2012 | 46.3727 |
| 2013 | 46.4033 |
| 2014 | 41.6447 |
| 2015 | 40.3274 |