| 年度 | 实际值 |
|---|---|
| 1992 | 30.49 |
| 1993 | 31.15 |
| 1994 | 31.83 |
| 1995 | 32.53 |
| 1996 | 33.51 |
| 1997 | 34.24 |
| 1998 | 35.02 |
| 1999 | 35.48 |
| 2000 | 36.05 |
| 2001 | 37.03 |
| 2002 | 37.94 |
| 2003 | 38.49 |
| 2004 | 38.96 |
| 2005 | 39.16 |
| 2006 | 40.15 |
| 2007 | 40.45 |
| 2008 | 40.81 |
| 2009 | |
| 2010 | 41.17 |
| 2011 | 41.7 |
| 2012 | 41.6 |
| 2013 | 41.9 |
| 2014 | 41.4 |
| 2015 | 41.52 |
| 2016 | 134 |
| 2017 | 134 |
| 2018 | 134 |