| 年度 | 实际值 |
|---|---|
| 1993 | 36 |
| 1994 | |
| 1995 | 20 |
| 1996 | 21.4 |
| 1997 | 50 |
| 1998 | 33.7 |
| 1999 | 35 |
| 2000 | 36.5 |
| 2001 | 2.16666666666667 |
| 2002 | |
| 2003 | 28.87 |
| 2004 | 32.03 |
| 2005 | 32 |
| 2006 | 32.75 |
| 2007 | 33.79 |
| 2008 | 28.95 |
| 2009 | |
| 2010 | 28.46 |
| 2011 | 31.13 |
| 2012 | 35.1 |
| 2013 | 35.02 |
| 2014 | 35.1 |
| 2015 | 35.67 |
| 2016 | 39.22 |
| 2017 | 39.7 |
| 2018 | 39.26 |