| 年度 | 实际值 |
|---|---|
| 1992 | 59.48 |
| 1993 | 60.25 |
| 1994 | 62.49 |
| 1995 | 63.49 |
| 1996 | 63.96 |
| 1997 | 64.62 |
| 1998 | 65.37 |
| 1999 | 66.23 |
| 2000 | 67.14 |
| 2001 | 68.15 |
| 2002 | 69.21 |
| 2003 | 70.19 |
| 2004 | 71.1 |
| 2005 | 71.78 |
| 2006 | 72 |
| 2007 | 86.4 |
| 2008 | 87.8 |
| 2009 | |
| 2010 | 87.75 |
| 2011 | 88.3 |
| 2012 | 88.8 |
| 2013 | 87.7 |
| 2014 | 87.7 |
| 2015 | 87.1 |
| 2016 | 88 |
| 2017 | 87 |
| 2018 | 87 |