| 年度 | 实际值 |
|---|---|
| 1992 | 84.4 |
| 1993 | |
| 1994 | |
| 1995 | 85 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 85.4 |
| 2000 | 85.5 |
| 2001 | 85 |
| 2002 | 85.3 |
| 2003 | 86 |
| 2004 | 87 |
| 2005 | 88 |
| 2006 | 89 |
| 2007 | 89.3 |
| 2008 | 89.84 |
| 2009 | 90.01 |
| 2010 | 90.51 |
| 2011 | 90.79 |
| 2012 | 91.0208 |
| 2013 | 91.47 |
| 2014 | 91.98 |
| 2015 | 92.28 |
| 2016 | 92.7 |
| 2017 | 92.9 |
| 2018 | 92.94 |