| 年度 | 实际值 |
|---|---|
| 1992 | 40.2 |
| 1993 | |
| 1994 | |
| 1995 | 40.9 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 42.1968 |
| 2000 | 42.8712 |
| 2001 | 42.4029 |
| 2002 | 42.7021 |
| 2003 | 43.1477 |
| 2004 | 43.1536 |
| 2005 | 43.3573 |
| 2006 | 43.9573 |
| 2007 | 44.1443 |
| 2008 | 43.7311 |
| 2009 | 44.1144 |
| 2010 | 44.1765 |
| 2011 | 44.2774 |
| 2012 | 44.535 |
| 2013 | 44.7759 |
| 2014 | 44.5052 |
| 2015 | 44.7591 |
| 2016 | 45 |
| 2017 | 45 |