| 年度 | 实际值 |
|---|---|
| 1992 | 75.85 |
| 1993 | 78.02 |
| 1994 | 80.71 |
| 1995 | 82.38 |
| 1996 | 84.05 |
| 1997 | 85.39 |
| 1998 | 86.11 |
| 1999 | 86.67 |
| 2000 | 124.75 |
| 2001 | 87.4 |
| 2002 | 87.77 |
| 2003 | 87.93 |
| 2004 | 87.77 |
| 2005 | 87.85 |
| 2006 | 87.66 |
| 2007 | 87.55 |
| 2008 | 88.57 |
| 2009 | 88.05 |
| 2010 | 88.45 |
| 2011 | 88.44 |
| 2012 | 88.72 |
| 2013 | 89.39 |
| 2014 | 87.6 |
| 2015 | 91.67 |