| 年度 | 实际值 |
|---|---|
| 1992 | 78.21 |
| 1993 | 78.86 |
| 1994 | 79.37 |
| 1995 | 80.14 |
| 1996 | 81.04 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 85.12 |
| 2001 | 85.82 |
| 2002 | 86.06 |
| 2003 | 86.6 |
| 2004 | 87.29 |
| 2005 | 87.98 |
| 2006 | 88.54 |
| 2007 | 89.2 |
| 2008 | 89.7 |
| 2009 | |
| 2010 | 89.91 |
| 2011 | 89.2 |
| 2012 | 88.6 |
| 2013 | 86.9 |
| 2014 | 84.3 |
| 2015 | 83.5 |
| 2016 | 83 |
| 2017 | 82 |
| 2018 | 84 |