| 年度 | 实际值 |
|---|---|
| 1992 | 44.36 |
| 1993 | 44.79 |
| 1994 | 45.35 |
| 1995 | 45.91 |
| 1996 | 46.19 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 48.98 |
| 2001 | 49.6 |
| 2002 | 50.17 |
| 2003 | 51.06 |
| 2004 | 51.58 |
| 2005 | 51.62 |
| 2006 | 52 |
| 2007 | 51.82 |
| 2008 | 52.34 |
| 2009 | |
| 2010 | 52.86 |
| 2011 | 53.4 |
| 2012 | 55.2 |
| 2013 | 55.4 |
| 2014 | 55.7 |
| 2015 | 54.13 |
| 2016 | 55 |
| 2017 | 55 |
| 2018 | 55 |