| 年度 | 实际值 |
|---|---|
| 1992 | 46.53 |
| 1993 | 48.13 |
| 1994 | 49.88 |
| 1995 | 51.04 |
| 1996 | 51.72 |
| 1997 | 52.26 |
| 1998 | 52.82 |
| 1999 | 53.56 |
| 2000 | 55.5 |
| 2001 | 56.19 |
| 2002 | 56.83 |
| 2003 | 57.65 |
| 2004 | 59.03 |
| 2005 | 59.77 |
| 2006 | 61.15 |
| 2007 | 62.46 |
| 2008 | 63.21 |
| 2009 | |
| 2010 | 64.09 |
| 2011 | 71.4 |
| 2012 | 71.7 |
| 2013 | 72.1 |
| 2014 | 72.5 |
| 2015 | 66.77 |
| 2016 | 67 |
| 2017 | 68 |
| 2018 | 68 |