| 年度 | 实际值 |
|---|---|
| 1992 | 64.44 |
| 1993 | 65.3 |
| 1994 | 66.89 |
| 1995 | 67.9 |
| 1996 | 68.62 |
| 1997 | 69.37 |
| 1998 | 69.82 |
| 1999 | 70.13 |
| 2000 | 70.99 |
| 2001 | 71.36 |
| 2002 | 71.38 |
| 2003 | 71.59 |
| 2004 | 71.63 |
| 2005 | 71.53 |
| 2006 | 71.89 |
| 2007 | 72.51 |
| 2008 | 72.62 |
| 2009 | |
| 2010 | 72.7 |
| 2011 | 74.9 |
| 2012 | 88 |
| 2013 | 87.8 |
| 2014 | 87.6 |
| 2015 | 87.19 |
| 2016 | 87 |
| 2017 | 86 |
| 2018 | 85 |