| 年度 | 实际值 |
|---|---|
| 1995 | 55.9 |
| 1996 | 55.5 |
| 1997 | 22.77 |
| 1998 | 74.8 |
| 1999 | 74.4 |
| 2000 | 75 |
| 2001 | 81 |
| 2002 | 80.89 |
| 2003 | 80.89 |
| 2004 | 76.29 |
| 2005 | 66.4 |
| 2006 | 67.55 |
| 2007 | 66.92 |
| 2008 | 65.81 |
| 2009 | |
| 2010 | 63.39 |
| 2011 | 63.29 |
| 2012 | 65.03 |
| 2013 | 66.26 |
| 2014 | 67.63 |
| 2015 | 68.5 |
| 2016 | 72.17 |
| 2017 | 77.49 |
| 2018 | 77.8 |