| 年度 | 实际值 |
|---|---|
| 1992 | 61.9 |
| 1993 | |
| 1994 | |
| 1995 | 63.4 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 65.1 |
| 2000 | 64.88 |
| 2001 | 64.94 |
| 2002 | 64.98 |
| 2003 | 65.08 |
| 2004 | 65.22 |
| 2005 | 65.28 |
| 2006 | 65.71 |
| 2007 | 66.12 |
| 2008 | 66.64 |
| 2009 | 67.05 |
| 2010 | 67.19 |
| 2011 | 67.59 |
| 2012 | 67.93 |
| 2013 | 68.56 |
| 2014 | 69.43 |
| 2015 | 70.11 |
| 2016 | 71 |
| 2017 | 72 |