| 年度 | 实际值 |
|---|---|
| 1993 | 21.9 |
| 1994 | |
| 1995 | 48.7 |
| 1996 | 25.8 |
| 1997 | 37.9 |
| 1998 | 33.1 |
| 1999 | 34.3 |
| 2000 | 27.5 |
| 2001 | 1.86 |
| 2002 | |
| 2003 | 58.27 |
| 2004 | 37.8 |
| 2005 | 48 |
| 2006 | 60.42 |
| 2007 | 66.72 |
| 2008 | 70.3 |
| 2009 | |
| 2010 | 42.27 |
| 2011 | 42.96 |
| 2012 | 44.43 |
| 2013 | 42.33 |
| 2014 | 42.09 |
| 2015 | 41.15 |
| 2016 | 40.88 |
| 2017 | 42.68 |
| 2018 | 44.8 |