| 年度 | 实际值 |
|---|---|
| 1995 | 83.7 |
| 1996 | 82.7 |
| 1997 | 50.13 |
| 1998 | 79.7 |
| 1999 | 79.3 |
| 2000 | 83.6 |
| 2001 | 81.52 |
| 2002 | 80.15 |
| 2003 | 81.05 |
| 2004 | 79.65 |
| 2005 | 83.07 |
| 2006 | 83.41 |
| 2007 | 82.46 |
| 2008 | 83.4 |
| 2009 | |
| 2010 | 70.06 |
| 2011 | 73.67 |
| 2012 | 73.42 |
| 2013 | 71.45 |
| 2014 | 58.97 |
| 2015 | 54.34 |
| 2016 | 46.05 |
| 2017 | 47.38 |
| 2018 | 44.64 |