| 年度 | 实际值 |
|---|---|
| 1995 | 36.1 |
| 1996 | 37.9 |
| 1997 | 38.84 |
| 1998 | 41.2 |
| 1999 | 44.7 |
| 2000 | 43 |
| 2001 | 44.17 |
| 2002 | 45.16 |
| 2003 | 44.76 |
| 2004 | 43.08 |
| 2005 | 49.01 |
| 2006 | 49.02 |
| 2007 | 48.65 |
| 2008 | 47.55 |
| 2009 | |
| 2010 | 45.3 |
| 2011 | 43.16 |
| 2012 | 44.01 |
| 2013 | 41.75 |
| 2014 | 44.68 |
| 2015 | 44.92 |
| 2016 | 47.28 |
| 2017 | |
| 2018 | 44.76 |