| 年度 | 实际值 |
|---|---|
| 1995 | 41.7 |
| 1996 | 46.2 |
| 1997 | 48.88 |
| 1998 | 50.2 |
| 1999 | 50.7 |
| 2000 | 51.9 |
| 2001 | 52.41 |
| 2002 | 52.79 |
| 2003 | 51.63 |
| 2004 | 52.5 |
| 2005 | 57.07 |
| 2006 | 62.99 |
| 2007 | |
| 2008 | 63.13 |
| 2009 | |
| 2010 | 70.04 |
| 2011 | 68.13 |
| 2012 | 73.56 |
| 2013 | 73.42 |
| 2014 | 55.66 |
| 2015 | 57.47 |
| 2016 | 57.02 |
| 2017 | 58.95 |
| 2018 | 62.4 |