| 年度 | 实际值 |
|---|---|
| 1992 | 39 |
| 1993 | |
| 1994 | |
| 1995 | 39.3 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 39.9 |
| 2000 | 40.02 |
| 2001 | 40.06 |
| 2002 | 40.11 |
| 2003 | 40.25 |
| 2004 | 40.57 |
| 2005 | 40.97 |
| 2006 | 41.42 |
| 2007 | 41.86 |
| 2008 | 42.27 |
| 2009 | 42.6 |
| 2010 | 42.92 |
| 2011 | 43.23 |
| 2012 | 43.53 |
| 2013 | 43.83 |
| 2014 | 44.06 |
| 2015 | 44.11 |
| 2016 | 44.3573 |
| 2017 | 45 |