| 年度 | 实际值 |
|---|---|
| 1995 | 70.7 |
| 1996 | 69.2 |
| 1997 | 79.85 |
| 1998 | 69.1 |
| 1999 | 68 |
| 2000 | 69.9 |
| 2001 | 66.19 |
| 2002 | 61.15 |
| 2003 | 64.47 |
| 2004 | 67.98 |
| 2005 | 68.03 |
| 2006 | 69.34 |
| 2007 | 71.99 |
| 2008 | 74.82 |
| 2009 | |
| 2010 | 68.44 |
| 2011 | 66.75 |
| 2012 | 66.8 |
| 2013 | 66.7 |
| 2014 | 67.6 |
| 2015 | 66.4027291180155 |
| 2016 | 65.03 |
| 2017 | 62.41 |
| 2018 | 62.68 |