| 年度 | 实际值 |
|---|---|
| 1995 | 44.4 |
| 1996 | 43.6 |
| 1997 | 41.77 |
| 1998 | 41.8 |
| 1999 | 40.6 |
| 2000 | 41.9 |
| 2001 | 43.38 |
| 2002 | 42.92 |
| 2003 | 41.9 |
| 2004 | 41.24 |
| 2005 | 42.14 |
| 2006 | 41.37 |
| 2007 | 41.53 |
| 2008 | 40.24 |
| 2009 | |
| 2010 | 38.56 |
| 2011 | 43.29 |
| 2012 | 42.41 |
| 2013 | 42.21 |
| 2014 | 42.01 |
| 2015 | 43.34 |
| 2016 | 44.34 |
| 2017 | |
| 2018 | 44.8 |