| 年度 | 实际值 |
|---|---|
| 1995 | 67.4 |
| 1996 | 65.2 |
| 1997 | 66.4 |
| 1998 | 67.6 |
| 1999 | 65.2 |
| 2000 | 64.5 |
| 2001 | 64.19 |
| 2002 | 57.3 |
| 2003 | 60.69 |
| 2004 | 61.66 |
| 2005 | 61.97 |
| 2006 | 61.38 |
| 2007 | 58.26 |
| 2008 | 58.71 |
| 2009 | |
| 2010 | 59.69 |
| 2011 | 61.12 |
| 2012 | 59.67 |
| 2013 | 61.18 |
| 2014 | 57.92 |
| 2015 | 55.83 |
| 2016 | 54.75 |
| 2017 | 62.1 |
| 2018 | 61.55 |