| 年度 | 实际值 |
|---|---|
| 1995 | 56.4 |
| 1996 | 52.8 |
| 1997 | 41.13 |
| 1998 | 50.3 |
| 1999 | 45.3 |
| 2000 | 45.7 |
| 2001 | 50.29 |
| 2002 | 48.84 |
| 2003 | 49.77 |
| 2004 | 48.26 |
| 2005 | 48.09 |
| 2006 | 46.78 |
| 2007 | 47.77 |
| 2008 | 47.46 |
| 2009 | |
| 2010 | 56.28 |
| 2011 | 61.99 |
| 2012 | 62.2 |
| 2013 | 69.2 |
| 2014 | 69.96 |
| 2015 | 65.25 |
| 2016 | 64.96 |
| 2017 | 65.72 |
| 2018 | 65.6 |