| 年度 | 实际值 |
|---|---|
| 1995 | 43.3 |
| 1996 | 44.3 |
| 1997 | 45.32 |
| 1998 | 45.1 |
| 1999 | 44.7 |
| 2000 | 44.7 |
| 2001 | 45.32 |
| 2002 | 45.52 |
| 2003 | 45.54 |
| 2004 | 46.76 |
| 2005 | 42.45 |
| 2006 | 44.05 |
| 2007 | 45.25 |
| 2008 | 46.57 |
| 2009 | |
| 2010 | 44.69 |
| 2011 | 45.86 |
| 2012 | 46.27 |
| 2013 | 45.91 |
| 2014 | 44.83 |
| 2015 | 43.73 |
| 2016 | 42.99 |
| 2017 | |
| 2018 | 42.47 |