| 年度 | 实际值 |
|---|---|
| 1995 | 42.9 |
| 1996 | 42.7 |
| 1997 | 42.79 |
| 1998 | 43.7 |
| 1999 | 45.1 |
| 2000 | 47.8 |
| 2001 | 48.43 |
| 2002 | 48.55 |
| 2003 | 48.69 |
| 2004 | 46.28 |
| 2005 | 50.25 |
| 2006 | 49.18 |
| 2007 | 48.7 |
| 2008 | 42.03 |
| 2009 | |
| 2010 | 41.96 |
| 2011 | 39.58 |
| 2012 | 39.61 |
| 2013 | 40.7 |
| 2014 | 41.81 |
| 2015 | 45.06 |
| 2016 | 47.8 |
| 2017 | |
| 2018 | 54.75 |