| 年度 | 实际值 |
|---|---|
| 1992 | 53.14 |
| 1993 | 54.28 |
| 1994 | 55.17 |
| 1995 | 56.11 |
| 1996 | 57.44 |
| 1997 | 58.41 |
| 1998 | 59.35 |
| 1999 | 60.62 |
| 2000 | 61.44 |
| 2001 | 65.34 |
| 2002 | 65.76 |
| 2003 | 66.38 |
| 2004 | 66.14 |
| 2005 | 67.68 |
| 2006 | 68.69 |
| 2007 | 68.2 |
| 2008 | 69.5 |
| 2009 | |
| 2010 | 69.8 |
| 2011 | 73.1 |
| 2012 | 70.7 |
| 2013 | 71 |
| 2014 | 74 |
| 2015 | 73.47 |
| 2016 | 74 |
| 2017 | 74 |
| 2018 | 75 |