| 年度 | 实际值 |
|---|---|
| 1993 | 16.4 |
| 1994 | |
| 1995 | 30.9 |
| 1996 | 30.9 |
| 1997 | 31.8 |
| 1998 | 31.8 |
| 1999 | 32.1 |
| 2000 | 31.9 |
| 2001 | 2.15333333333333 |
| 2002 | |
| 2003 | 26.94 |
| 2004 | 27.79 |
| 2005 | 35 |
| 2006 | 35.43 |
| 2007 | 36.42 |
| 2008 | 36.56 |
| 2009 | |
| 2010 | 40.5 |
| 2011 | 41.12 |
| 2012 | 41.79 |
| 2013 | 41.88 |
| 2014 | 42.11 |
| 2015 | 43.67 |
| 2016 | 43.93 |
| 2017 | |
| 2018 | 44.27 |