| 年度 | 实际值 |
|---|---|
| 1992 | 49.5 |
| 1993 | |
| 1994 | |
| 1995 | 52.1 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 55.4693 |
| 2000 | 52.07 |
| 2001 | 52.7398 |
| 2002 | 52.7599 |
| 2003 | 52.6998 |
| 2004 | 52.8324 |
| 2005 | 52.0816 |
| 2006 | 52.7315 |
| 2007 | 53.7495 |
| 2008 | 53.5424 |
| 2009 | 53.5344 |
| 2010 | 53.5473 |
| 2011 | 53.7786 |
| 2012 | 53.5011 |
| 2013 | 53.3834 |
| 2014 | 53.2546 |
| 2015 | 51.909 |
| 2016 | 53 |
| 2017 | 52 |