| 年度 | 实际值 |
|---|---|
| 1992 | 70.77 |
| 1993 | 71.26 |
| 1994 | 72.5 |
| 1995 | 73.36 |
| 1996 | 74.39 |
| 1997 | |
| 1998 | |
| 1999 | 78.18 |
| 2000 | 78.17 |
| 2001 | 79.09 |
| 2002 | 79.52 |
| 2003 | 80.19 |
| 2004 | 80.1 |
| 2005 | 80.52 |
| 2006 | 81.25 |
| 2007 | 82.21 |
| 2008 | 82.28 |
| 2009 | |
| 2010 | 76.3 |
| 2011 | 77.3 |
| 2012 | 84.8 |
| 2013 | 85.7 |
| 2014 | 85.8 |
| 2015 | 85.44 |
| 2016 | 84 |
| 2017 | 84 |
| 2018 | 84 |