| 年度 | 实际值 |
|---|---|
| 1992 | 62.37 |
| 1993 | 63.62 |
| 1994 | 66.23 |
| 1995 | 67.87 |
| 1996 | 69.02 |
| 1997 | 70.32 |
| 1998 | 71.71 |
| 1999 | 72.84 |
| 2000 | 74.1 |
| 2001 | 77.67 |
| 2002 | 78.36 |
| 2003 | 79.83 |
| 2004 | 80.68 |
| 2005 | 81.12 |
| 2006 | 81.85 |
| 2007 | 82.46 |
| 2008 | 82.88 |
| 2009 | |
| 2010 | 83.52 |
| 2011 | 84.7 |
| 2012 | 96.3 |
| 2013 | 98.3 |
| 2014 | 98.5 |
| 2015 | 98.47 |
| 2016 | 99 |
| 2017 | 98 |
| 2018 | 75 |