| 年度 | 实际值 |
|---|---|
| 1995 | 59.5 |
| 1996 | 56.9 |
| 1997 | 35.51 |
| 1998 | 64.6 |
| 1999 | 64 |
| 2000 | 61.4 |
| 2001 | 61.71 |
| 2002 | 58.75 |
| 2003 | 52.02 |
| 2004 | 47.45 |
| 2005 | 42.57 |
| 2006 | 39.09 |
| 2007 | 39.22 |
| 2008 | 39.62 |
| 2009 | |
| 2010 | 39.54 |
| 2011 | 40.37 |
| 2012 | 39.59 |
| 2013 | 39.9 |
| 2014 | 38.14 |
| 2015 | 40.6 |
| 2016 | 39.54 |
| 2017 | 40.17 |
| 2018 | 54.4 |