| 年度 | 实际值 |
|---|---|
| 1992 | 60.53 |
| 1993 | 61.5 |
| 1994 | 62.32 |
| 1995 | 63.14 |
| 1996 | 65.18 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 72.53 |
| 2001 | 73.91 |
| 2002 | 75.58 |
| 2003 | 76.8 |
| 2004 | 78.17 |
| 2005 | 78.21 |
| 2006 | 78.25 |
| 2007 | 80.9 |
| 2008 | 82.23 |
| 2009 | |
| 2010 | 83.3 |
| 2011 | 84.1 |
| 2012 | 80.6 |
| 2013 | 80.6 |
| 2014 | 80.6 |
| 2015 | 80.93 |
| 2016 | 81 |
| 2017 | 82 |
| 2018 | 82 |