| 年度 | 实际值 |
|---|---|
| 1995 | 64.3 |
| 1996 | 65.7 |
| 1997 | 67.12 |
| 1998 | 64.4 |
| 1999 | 64.2 |
| 2000 | 64.4 |
| 2001 | 65.13 |
| 2002 | 66.64 |
| 2003 | 71.02 |
| 2004 | 73.21 |
| 2005 | 63.01 |
| 2006 | 63.59 |
| 2007 | 65.54 |
| 2008 | 66.17 |
| 2009 | |
| 2010 | 71.72 |
| 2011 | 72.83 |
| 2012 | 73.45 |
| 2013 | 65.94 |
| 2014 | 63.4 |
| 2015 | 57.01 |
| 2016 | 56.58 |
| 2017 | |
| 2018 | 61.94 |