| 年度 | 实际值 |
|---|---|
| 1992 | 68.83 |
| 1993 | 69.49 |
| 1994 | 71.64 |
| 1995 | 72.41 |
| 1996 | 73.17 |
| 1997 | 73.66 |
| 1998 | 77.58 |
| 1999 | 74.91 |
| 2000 | 75.6 |
| 2001 | 76.45 |
| 2002 | 77.49 |
| 2003 | 78.47 |
| 2004 | 79.37 |
| 2005 | 79.85 |
| 2006 | 81.11 |
| 2007 | 82.19 |
| 2008 | 91.15 |
| 2009 | |
| 2010 | 92.24 |
| 2011 | 86.3 |
| 2012 | 87.3 |
| 2013 | 88.7 |
| 2014 | 88.7 |
| 2015 | 89.49 |
| 2016 | 90 |
| 2017 | 90 |
| 2018 | 90 |