| 年度 | 实际值 |
|---|---|
| 1993 | 10.3 |
| 1994 | |
| 1995 | 33 |
| 1996 | 33.5 |
| 1997 | 36 |
| 1998 | 35.7 |
| 1999 | 35.5 |
| 2000 | 35.9 |
| 2001 | 2.32666666666667 |
| 2002 | |
| 2003 | 36.95 |
| 2004 | 36.81 |
| 2005 | 40 |
| 2006 | 40.41 |
| 2007 | 43.15 |
| 2008 | 43.45 |
| 2009 | |
| 2010 | 43.29 |
| 2011 | 42.83 |
| 2012 | 43.03 |
| 2013 | 43.21 |
| 2014 | 43.49 |
| 2015 | 43.71 |
| 2016 | 43.81 |
| 2017 | 43 |
| 2018 | 44 |