| 年度 | 实际值 |
|---|---|
| 1992 | 81.57 |
| 1993 | 80.71 |
| 1994 | 81.35 |
| 1995 | 81.57 |
| 1996 | 82.76 |
| 1997 | 83.41 |
| 1998 | 83.43 |
| 1999 | 84.9 |
| 2000 | 86.32 |
| 2001 | 86.63 |
| 2002 | 86.34 |
| 2003 | 87.44 |
| 2004 | 88.15 |
| 2005 | 88.43 |
| 2006 | 89.07 |
| 2007 | 89.51 |
| 2008 | 90.22 |
| 2009 | |
| 2010 | 92.86 |
| 2011 | 92.7 |
| 2012 | 92.4 |
| 2013 | 92 |
| 2014 | |
| 2015 | 83.11 |
| 2016 | 80 |
| 2017 | 79 |
| 2018 | 78 |