| 年度 | 实际值 |
|---|---|
| 1992 | 36.62 |
| 1993 | 37.66 |
| 1994 | 38.9 |
| 1995 | 40.29 |
| 1996 | 41.42 |
| 1997 | 42.15 |
| 1998 | 44.04 |
| 1999 | 44.97 |
| 2000 | 46.23 |
| 2001 | 46.78 |
| 2002 | 47.52 |
| 2003 | 47.83 |
| 2004 | 48.86 |
| 2005 | 49.89 |
| 2006 | 50.06 |
| 2007 | 51.02 |
| 2008 | 52.06 |
| 2009 | |
| 2010 | 53.29 |
| 2011 | 54.2 |
| 2012 | 53.6 |
| 2013 | 53.4 |
| 2014 | 54.4 |
| 2015 | 54.97 |
| 2016 | 56 |
| 2017 | 57 |
| 2018 | 58 |