| 年度 | 实际值 |
|---|---|
| 1993 | 30.5 |
| 1994 | |
| 1995 | 64.7 |
| 1996 | 60.8 |
| 1997 | 41.1 |
| 1998 | 41.1 |
| 1999 | 41.1 |
| 2000 | 42 |
| 2001 | 2.80666666666667 |
| 2002 | |
| 2003 | 39.63 |
| 2004 | 41.46 |
| 2005 | 42 |
| 2006 | 29 |
| 2007 | 42.83 |
| 2008 | 43.23 |
| 2009 | |
| 2010 | 52.79 |
| 2011 | 55.47 |
| 2012 | 70.92 |
| 2013 | 51.33 |
| 2014 | 51.44 |
| 2015 | 51.44 |
| 2016 | 51.44 |
| 2017 | 67 |
| 2018 | 51.61 |