| 年度 | 实际值 |
|---|---|
| 1992 | 44.9 |
| 1993 | |
| 1994 | |
| 1995 | 45.6 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 46.7 |
| 2000 | 47.6 |
| 2001 | 47.6733 |
| 2002 | 47.8368 |
| 2003 | 47.904 |
| 2004 | 47.9016 |
| 2005 | 48.0432 |
| 2006 | 48.4963 |
| 2007 | 48.7402 |
| 2008 | 49.4046 |
| 2009 | 50.1058 |
| 2010 | 52 |
| 2011 | 52 |
| 2012 | 52 |
| 2013 | 52 |
| 2014 | 53 |
| 2015 | 54 |
| 2016 | 54 |
| 2017 | 54 |