| 年度 | 实际值 |
|---|---|
| 1995 | 53.3 |
| 1996 | 53.1 |
| 1997 | 29.27 |
| 1998 | 57.3 |
| 1999 | 60.7 |
| 2000 | 63.5 |
| 2001 | 64.22 |
| 2002 | 63.06 |
| 2003 | 59.41 |
| 2004 | 57.66 |
| 2005 | 62.52 |
| 2006 | 63.53 |
| 2007 | 67.08 |
| 2008 | 63.58 |
| 2009 | |
| 2010 | 66.21 |
| 2011 | 58.34 |
| 2012 | 55.05 |
| 2013 | 53.52 |
| 2014 | 55.5 |
| 2015 | 55.87 |
| 2016 | 57.87 |
| 2017 | 60.18 |
| 2018 | 60.36 |