| 年度 | 实际值 |
|---|---|
| 1995 | 60.7 |
| 1996 | 61 |
| 1997 | 25.86 |
| 1998 | 61.7 |
| 1999 | 62.8 |
| 2000 | 67 |
| 2001 | 67.05 |
| 2002 | 67.83 |
| 2003 | 69.81 |
| 2004 | 71.11 |
| 2005 | 63.53 |
| 2006 | 64.68 |
| 2007 | 67.63 |
| 2008 | 68.38 |
| 2009 | |
| 2010 | 67.38 |
| 2011 | 68.3 |
| 2012 | 65.78 |
| 2013 | 65.92 |
| 2014 | 64.34 |
| 2015 | 63.33 |
| 2016 | 62.93 |
| 2017 | 61.45 |
| 2018 | 59.71 |