| 年度 | 实际值 |
|---|---|
| 1992 | 44.1 |
| 1993 | |
| 1994 | |
| 1995 | 45.4 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 46.9 |
| 2000 | 47.8 |
| 2001 | 48.0943 |
| 2002 | 48.3069 |
| 2003 | 48.7534 |
| 2004 | 48.012 |
| 2005 | 48.3988 |
| 2006 | 49.0553 |
| 2007 | 48.9204 |
| 2008 | 49.8381 |
| 2009 | 50.9873 |
| 2010 | 52 |
| 2011 | 54 |
| 2012 | 53 |
| 2013 | 54 |
| 2014 | 54 |
| 2015 | 55 |
| 2016 | 56 |
| 2017 | 56 |