| 年度 | 实际值 |
|---|---|
| 1995 | 48.6 |
| 1996 | 50.3 |
| 1997 | 54.99 |
| 1998 | 48.5 |
| 1999 | 48.1 |
| 2000 | 55.1 |
| 2001 | 55.03 |
| 2002 | 55.51 |
| 2003 | 57.38 |
| 2004 | 59.03 |
| 2005 | 61.49 |
| 2006 | 63.42 |
| 2007 | 63.06 |
| 2008 | 65.42 |
| 2009 | |
| 2010 | 62.4 |
| 2011 | 64.68 |
| 2012 | 65.82 |
| 2013 | 63.61 |
| 2014 | 38.88 |
| 2015 | 37.09 |
| 2016 | 34.44 |
| 2017 | 32.64 |
| 2018 | 33.1 |