| 年度 | 实际值 |
|---|---|
| 1995 | 62.4 |
| 1996 | 65.2 |
| 1997 | 60.93 |
| 1998 | 69.4 |
| 1999 | 63.3 |
| 2000 | 64 |
| 2001 | 64.59 |
| 2002 | 64.38 |
| 2003 | 64.47 |
| 2004 | 67.35 |
| 2005 | 64 |
| 2006 | 61.77 |
| 2007 | 60.01 |
| 2008 | 63.23 |
| 2009 | |
| 2010 | 54.29 |
| 2011 | 55.83 |
| 2012 | 53.74 |
| 2013 | 42.48 |
| 2014 | 48.3 |
| 2015 | 44.98 |
| 2016 | 44.08 |
| 2017 | 42.5 |
| 2018 | 40.96 |