| 年度 | 实际值 |
|---|---|
| 1993 | 35.1 |
| 1994 | |
| 1995 | 36.9 |
| 1996 | 38.8 |
| 1997 | 39.2 |
| 1998 | 39.4 |
| 1999 | 40 |
| 2000 | 40.5 |
| 2001 | 2.73333333333333 |
| 2002 | |
| 2003 | 41.94 |
| 2004 | 42.41 |
| 2005 | 43 |
| 2006 | 42.8 |
| 2007 | 43.31 |
| 2008 | 44 |
| 2009 | |
| 2010 | 44.75 |
| 2011 | 45.17 |
| 2012 | 44.68 |
| 2013 | 44.69 |
| 2014 | 44.78 |
| 2015 | 44.87 |
| 2016 | 44.89 |
| 2017 | 46.56 |
| 2018 | 46.67 |