| 年度 | 实际值 |
|---|---|
| 1992 | 56.83 |
| 1993 | 57.46 |
| 1994 | 58.4 |
| 1995 | 59.33 |
| 1996 | 60.19 |
| 1997 | 61.3 |
| 1998 | 62 |
| 1999 | 62.58 |
| 2000 | 63.15 |
| 2001 | 63.86 |
| 2002 | 64.3 |
| 2003 | 64.96 |
| 2004 | 65.36 |
| 2005 | 65.64 |
| 2006 | 66.42 |
| 2007 | 67.21 |
| 2008 | 68.02 |
| 2009 | |
| 2010 | 68.76 |
| 2011 | 69.7 |
| 2012 | 70.2 |
| 2013 | 70.7 |
| 2014 | 70.9 |
| 2015 | 70.02 |
| 2016 | 70 |
| 2017 | 70 |
| 2018 | 70 |