| 年度 | 实际值 |
|---|---|
| 1995 | 64 |
| 1996 | 63.6 |
| 1997 | 54.33 |
| 1998 | 66.4 |
| 1999 | 66.6 |
| 2000 | 64.6 |
| 2001 | 57.04 |
| 2002 | 53.37 |
| 2003 | 51.05 |
| 2004 | 51.75 |
| 2005 | 56.19 |
| 2006 | 63.24 |
| 2007 | 64.99 |
| 2008 | 65.02 |
| 2009 | |
| 2010 | 66.73 |
| 2011 | 69.1 |
| 2012 | 69.54 |
| 2013 | 70.02 |
| 2014 | 67.13 |
| 2015 | 68.36 |
| 2016 | 67.16 |
| 2017 | 66.26 |
| 2018 | 64.7 |