| 年度 | 实际值 |
|---|---|
| 1992 | 41.7 |
| 1993 | |
| 1994 | |
| 1995 | 43.2 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 45.2 |
| 2000 | 46.3 |
| 2001 | 46.7279 |
| 2002 | 46.8954 |
| 2003 | 46.9665 |
| 2004 | 47.332 |
| 2005 | 47.5469 |
| 2006 | 47.9169 |
| 2007 | 49.8063 |
| 2008 | 50.036 |
| 2009 | 50.5062 |
| 2010 | 51 |
| 2011 | 52 |
| 2012 | 51 |
| 2013 | 52 |
| 2014 | 53 |
| 2015 | 54 |
| 2016 | 54 |
| 2017 | 54 |