| 年度 | 实际值 |
|---|---|
| 1995 | 88.2 |
| 1996 | 88.4 |
| 1997 | 59.05 |
| 1998 | 86.7 |
| 1999 | 86.6 |
| 2000 | 90.1 |
| 2001 | 89.4 |
| 2002 | 84.94 |
| 2003 | 86.19 |
| 2004 | 86.41 |
| 2005 | 86.42 |
| 2006 | 83.21 |
| 2007 | 77.52 |
| 2008 | 78.7 |
| 2009 | |
| 2010 | 76.43 |
| 2011 | 74.2 |
| 2012 | 73.69 |
| 2013 | 72.46 |
| 2014 | 68.33 |
| 2015 | 66.2 |
| 2016 | 62.43 |
| 2017 | 63.3 |
| 2018 | 62.66 |