| 年度 | 实际值 |
|---|---|
| 1995 | 60.5 |
| 1996 | 63.2 |
| 1997 | 40.35 |
| 1998 | 41.3 |
| 1999 | 43 |
| 2000 | 44.8 |
| 2001 | 46.46 |
| 2002 | 47.76 |
| 2003 | 49.59 |
| 2004 | 49.51 |
| 2005 | 48.77 |
| 2006 | 51.17 |
| 2007 | 52.34 |
| 2008 | 55.22 |
| 2009 | |
| 2010 | 59.62 |
| 2011 | 61.92 |
| 2012 | 62.28 |
| 2013 | 60.65 |
| 2014 | 59.48 |
| 2015 | 58.32 |
| 2016 | 54.88 |
| 2017 | |
| 2018 | 49.68 |