| 年度 | 实际值 |
|---|---|
| 1995 | 39.4 |
| 1996 | 42.9 |
| 1997 | 46.37 |
| 1998 | 46.6 |
| 1999 | 47.1 |
| 2000 | 39.5 |
| 2001 | 39.78 |
| 2002 | 37.41 |
| 2003 | 39.35 |
| 2004 | 41.34 |
| 2005 | 40.61 |
| 2006 | 42.4 |
| 2007 | 43.17 |
| 2008 | 44.51 |
| 2009 | |
| 2010 | 45.57 |
| 2011 | 47.29 |
| 2012 | 47.96 |
| 2013 | 48.82 |
| 2014 | 49.77 |
| 2015 | 48.53 |
| 2016 | 46.75 |
| 2017 | |
| 2018 | 47.81 |