| 年度 | 实际值 |
|---|---|
| 1992 | 88.37 |
| 1993 | 89.3 |
| 1994 | 90.42 |
| 1995 | 90.52 |
| 1996 | 90.77 |
| 1997 | 91.15 |
| 1998 | 91.8 |
| 1999 | 91.99 |
| 2000 | 92.4 |
| 2001 | 92 |
| 2002 | 91.87 |
| 2003 | 91.32 |
| 2004 | 90.63 |
| 2005 | 89.76 |
| 2006 | 89.11 |
| 2007 | 90.87 |
| 2008 | 88.46 |
| 2009 | |
| 2010 | 88.11 |
| 2011 | 87.3 |
| 2012 | 85.5 |
| 2013 | 85.2 |
| 2014 | 84.5 |
| 2015 | 83.32 |
| 2016 | 83 |
| 2017 | 80 |
| 2018 | 78 |