| 年度 | 实际值 |
|---|---|
| 1992 | 67.2 |
| 1993 | |
| 1994 | |
| 1995 | 67 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 68.4 |
| 2000 | 68.9 |
| 2001 | 69.3 |
| 2002 | 69.8 |
| 2003 | 70.2 |
| 2004 | 70.9 |
| 2005 | 71.3 |
| 2006 | 72 |
| 2007 | 72.31 |
| 2008 | 72.5 |
| 2009 | 72.8 |
| 2010 | 72.7 |
| 2011 | 73 |
| 2012 | 73 |
| 2013 | 72.7 |
| 2014 | 73.27 |
| 2015 | 73.55 |
| 2016 | 73.9322 |
| 2017 | 74 |
| 2018 | 74.4253 |