| 年度 | 实际值 |
|---|---|
| 1995 | 55.5 |
| 1996 | 59.8 |
| 1997 | 82.84 |
| 1998 | 55.3 |
| 1999 | 53.5 |
| 2000 | 55.5 |
| 2001 | 51.98 |
| 2002 | 56.98 |
| 2003 | 56.98 |
| 2004 | 59.88 |
| 2005 | 66.74 |
| 2006 | 66.04 |
| 2007 | 68.1 |
| 2008 | 65.78 |
| 2009 | |
| 2010 | 59.86 |
| 2011 | 56.68 |
| 2012 | 56.83 |
| 2013 | 54.76 |
| 2014 | 53.68 |
| 2015 | 52.33 |
| 2016 | 49.38 |
| 2017 | 54.36 |
| 2018 | 58.5 |