| 年度 | 实际值 |
|---|---|
| 1992 | 78.54 |
| 1993 | 79.17 |
| 1994 | 79.74 |
| 1995 | 80.42 |
| 1996 | 80.81 |
| 1997 | 81.71 |
| 1998 | 82.28 |
| 1999 | 82.5 |
| 2000 | 83.22 |
| 2001 | 83.5 |
| 2002 | 83.79 |
| 2003 | 83.98 |
| 2004 | 84.33 |
| 2005 | 84.39 |
| 2006 | 84.55 |
| 2007 | 84.86 |
| 2008 | 85.06 |
| 2009 | 85.3125 |
| 2010 | 85.4388 |
| 2011 | 85.4604 |
| 2012 | 85.3023 |
| 2013 | 85.5651 |
| 2014 | |
| 2015 | 83.64 |
| 2016 | 84 |
| 2017 | 83 |
| 2018 | 80 |