| 年度 | 实际值 |
|---|---|
| 1994 | 43.3 |
| 1995 | 43.86 |
| 1996 | 44.32 |
| 1997 | 44.6 |
| 1998 | 44.94 |
| 1999 | 45.3 |
| 2000 | 45.64 |
| 2001 | 46.05 |
| 2002 | 46.28 |
| 2003 | 46.57 |
| 2004 | 47.19 |
| 2005 | 48.19 |
| 2006 | 48.59 |
| 2007 | 48.37 |
| 2008 | 50.42 |
| 2009 | |
| 2010 | 49.88 |
| 2011 | 51.8 |
| 2012 | 52 |
| 2013 | 52.6 |
| 2014 | 53.2 |
| 2015 | 52.47 |
| 2016 | 53 |
| 2017 | 53 |
| 2018 | 53 |