| 年度 | 实际值 |
|---|---|
| 1995 | 75.6 |
| 1996 | 74.1 |
| 1997 | 40.49 |
| 1998 | 78.5 |
| 1999 | 75.8 |
| 2000 | 72.9 |
| 2001 | 72.4 |
| 2002 | 72.8 |
| 2003 | 73.69 |
| 2004 | 72.21 |
| 2005 | 76.25 |
| 2006 | 75.4 |
| 2007 | 72.57 |
| 2008 | 73.26 |
| 2009 | |
| 2010 | 72.85 |
| 2011 | 70.64 |
| 2012 | 71.37 |
| 2013 | 70.33 |
| 2014 | 49.94 |
| 2015 | 45.59 |
| 2016 | 46.81 |
| 2017 | 45.47 |
| 2018 | 41.57 |