| 年度 | 实际值 |
|---|---|
| 1995 | 70.8 |
| 1996 | 68.9 |
| 1997 | 69.21 |
| 1998 | 66.1 |
| 1999 | 66.7 |
| 2000 | 75.6 |
| 2001 | 70.66 |
| 2002 | 68.72 |
| 2003 | 69.76 |
| 2004 | 68.54 |
| 2005 | 72.23 |
| 2006 | 73.05 |
| 2007 | 71.51 |
| 2008 | 72.46 |
| 2009 | |
| 2010 | 66.55 |
| 2011 | 68.06 |
| 2012 | 67.76 |
| 2013 | 67.45 |
| 2014 | 56.7 |
| 2015 | 53.48 |
| 2016 | 45.52 |
| 2017 | |
| 2018 | 50.65 |