| 年度 | 实际值 |
|---|---|
| 1992 | 60.4 |
| 1993 | |
| 1994 | |
| 1995 | 61.4 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 61.6 |
| 2000 | 61.84 |
| 2001 | 61.84 |
| 2002 | 62.06 |
| 2003 | 62.01 |
| 2004 | 62.05 |
| 2005 | 61.87 |
| 2006 | 61.64 |
| 2007 | 61.6 |
| 2008 | 61.79 |
| 2009 | 62.05 |
| 2010 | 62.31 |
| 2011 | 62.61 |
| 2012 | 62.6 |
| 2013 | 62.82 |
| 2014 | 63.05 |
| 2015 | 62.94 |
| 2016 | 63.2382 |
| 2017 | 63 |