| 年度 | 实际值 |
|---|---|
| 1995 | 91.4 |
| 1996 | 88.3 |
| 1997 | 33.56 |
| 1998 | 87.4 |
| 1999 | 88.3 |
| 2000 | 92.3 |
| 2001 | 91.47 |
| 2002 | 89.56 |
| 2003 | 88.71 |
| 2004 | 88.15 |
| 2005 | 88.99 |
| 2006 | 88.76 |
| 2007 | 87.97 |
| 2008 | 84.31 |
| 2009 | |
| 2010 | 82.39 |
| 2011 | 85.12 |
| 2012 | 83.73 |
| 2013 | 82.23 |
| 2014 | 80.07 |
| 2015 | 68.51 |
| 2016 | 58.77 |
| 2017 | 62.09 |
| 2018 | 58.75 |