| 年度 | 实际值 |
|---|---|
| 1992 | 44.2 |
| 1993 | |
| 1994 | |
| 1995 | 44 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 44.1 |
| 2000 | 44.83 |
| 2001 | 44.9 |
| 2002 | 44.97 |
| 2003 | 44.99 |
| 2004 | 45.05 |
| 2005 | 45.08 |
| 2006 | 45.49 |
| 2007 | 45.59 |
| 2008 | 45.64 |
| 2009 | 45.63 |
| 2010 | 45.53 |
| 2011 | 45.42 |
| 2012 | 45.05 |
| 2013 | 44.78 |
| 2014 | 44.6 |
| 2015 | 44.32 |
| 2016 | 43.4 |
| 2017 | 42.6 |
| 2018 | 42.1509 |