| 年度 | 实际值 |
|---|---|
| 1995 | 54.3 |
| 1996 | 51.8 |
| 1997 | 23.61 |
| 1998 | 60.9 |
| 1999 | 63.9 |
| 2000 | 64.1 |
| 2001 | 60.9 |
| 2002 | 60.45 |
| 2003 | 60.44 |
| 2004 | 58.97 |
| 2005 | 57.13 |
| 2006 | 65.85 |
| 2007 | 61.04 |
| 2008 | 60.8 |
| 2009 | |
| 2010 | 57.89 |
| 2011 | 56.9 |
| 2012 | 41.14 |
| 2013 | 42.82 |
| 2014 | 38.72 |
| 2015 | 40.75 |
| 2016 | 64.42 |
| 2017 | 65.67 |
| 2018 | 64.34 |