| 年度 | 实际值 |
|---|---|
| 1995 | 65.3 |
| 1996 | 61.5 |
| 1997 | 29.35 |
| 1998 | 56.7 |
| 1999 | 58.6 |
| 2000 | 59 |
| 2001 | 58.97 |
| 2002 | 59.47 |
| 2003 | 61.32 |
| 2004 | 67.41 |
| 2005 | 64.72 |
| 2006 | 69.5 |
| 2007 | 69.81 |
| 2008 | 67.81 |
| 2009 | |
| 2010 | 68.81 |
| 2011 | 75.18 |
| 2012 | 73.77 |
| 2013 | 72.22 |
| 2014 | 71.01 |
| 2015 | 63.6 |
| 2016 | 62.14 |
| 2017 | 63.67 |
| 2018 | 60.81 |