| 年度 | 实际值 |
|---|---|
| 1992 | 46.1 |
| 1993 | |
| 1994 | |
| 1995 | 47.5 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 48.2 |
| 2000 | 48.3352 |
| 2001 | 49.2805 |
| 2002 | 49.4041 |
| 2003 | 49.781 |
| 2004 | 49.8487 |
| 2005 | 50.04 |
| 2006 | 50.01 |
| 2007 | 50.21 |
| 2008 | 50.266863436816 |
| 2009 | 50.8945 |
| 2010 | 51.4845 |
| 2011 | 52.3639 |
| 2012 | 52.944 |
| 2013 | 53.6917 |
| 2014 | 49.5 |
| 2015 | 49.7049851736023 |
| 2016 | 54 |
| 2017 | 33 |