| 年度 | 实际值 |
|---|---|
| 1992 | 71.89 |
| 1993 | 72.85 |
| 1994 | 73.62 |
| 1995 | 75.68 |
| 1996 | 78.29 |
| 1997 | 78.92 |
| 1998 | 79.05 |
| 1999 | 79.76 |
| 2000 | 80.4 |
| 2001 | 81.55 |
| 2002 | 80.45 |
| 2003 | 77.45 |
| 2004 | 78.77 |
| 2005 | 78.14 |
| 2006 | 79.17 |
| 2007 | 80.1 |
| 2008 | 79.4 |
| 2009 | |
| 2010 | 79.91 |
| 2011 | 88.6 |
| 2012 | 88.7 |
| 2013 | 89 |
| 2014 | 88.9 |
| 2015 | 88.3 |
| 2016 | 88 |
| 2017 | 87 |
| 2018 | 87 |