| 年度 | 实际值 |
|---|---|
| 1992 | 43.66 |
| 1993 | 43.84 |
| 1994 | 44.27 |
| 1995 | 44.92 |
| 1996 | 45.44 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | |
| 2001 | |
| 2002 | 49.82 |
| 2003 | 49.77 |
| 2004 | 49.54 |
| 2005 | 50.17 |
| 2006 | 50.66 |
| 2007 | 51.25 |
| 2008 | 51.63 |
| 2009 | |
| 2010 | 51.87 |
| 2011 | 51.7 |
| 2012 | 51.5 |
| 2013 | 51.9 |
| 2014 | 50.7 |
| 2015 | 50.82 |
| 2016 | 51 |
| 2017 | 51 |
| 2018 | 51 |