| 年度 | 实际值 |
|---|---|
| 1995 | 70 |
| 1996 | 71 |
| 1997 | 58.02 |
| 1998 | 66.5 |
| 1999 | 64.5 |
| 2000 | 61.6 |
| 2001 | 61.67 |
| 2002 | 62.26 |
| 2003 | 64.53 |
| 2004 | 67.24 |
| 2005 | 65.1 |
| 2006 | 60.4 |
| 2007 | 62.44 |
| 2008 | 66.05 |
| 2009 | |
| 2010 | 66.99 |
| 2011 | 70.97 |
| 2012 | 70.22 |
| 2013 | 71.98 |
| 2014 | 66.86 |
| 2015 | 60.89 |
| 2016 | 59.48 |
| 2017 | 58.86 |
| 2018 | 56.53 |