| 年度 | 实际值 |
|---|---|
| 1995 | 48.4 |
| 1996 | 48.3 |
| 1997 | 36.46 |
| 1998 | 50.5 |
| 1999 | 51.3 |
| 2000 | 51.6 |
| 2001 | 46.34 |
| 2002 | 46.85 |
| 2003 | 45.38 |
| 2004 | 44.37 |
| 2005 | 47.41 |
| 2006 | 48.88 |
| 2007 | 49.92 |
| 2008 | 50.55 |
| 2009 | |
| 2010 | 53.33 |
| 2011 | 53.42 |
| 2012 | 55.15 |
| 2013 | 57.12 |
| 2014 | 57.9 |
| 2015 | 60.99 |
| 2016 | 63.63 |
| 2017 | 64.54 |
| 2018 | 65.17 |