| 年度 | 实际值 |
|---|---|
| 1993 | 23.4 |
| 1994 | |
| 1995 | 56.6 |
| 1996 | 60.7 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 48.4 |
| 2001 | 3.22666666666667 |
| 2002 | |
| 2003 | 29.62 |
| 2004 | 29.62 |
| 2005 | 29 |
| 2006 | 33.15 |
| 2007 | 32.45 |
| 2008 | 32.44 |
| 2009 | |
| 2010 | 32.62 |
| 2011 | 35.56 |
| 2012 | 36.89 |
| 2013 | 43.44 |
| 2014 | 43.62 |
| 2015 | 40.43 |
| 2016 | 28.75 |
| 2017 | 39.21 |
| 2018 | 39.81 |