| 年度 | 实际值 |
|---|---|
| 1993 | 22.2 |
| 1994 | |
| 1995 | 38.2 |
| 1996 | 38.2 |
| 1997 | 32 |
| 1998 | 32.9 |
| 1999 | 38.4 |
| 2000 | 40.3 |
| 2001 | 2.59333333333333 |
| 2002 | |
| 2003 | 39.1 |
| 2004 | 41.07 |
| 2005 | 42 |
| 2006 | 42.7 |
| 2007 | 42.93 |
| 2008 | 45.75 |
| 2009 | |
| 2010 | 45.84 |
| 2011 | 49.4 |
| 2012 | 48.98 |
| 2013 | 56.16 |
| 2014 | 92.87 |
| 2015 | 40.17 |
| 2016 | 40.37 |
| 2017 | 40.24 |
| 2018 | 41.29 |