| 年度 | 实际值 |
|---|---|
| 1992 | 32.7 |
| 1993 | |
| 1994 | |
| 1995 | 33.5 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 34.5015 |
| 2000 | 34.3975 |
| 2001 | 34.8166 |
| 2002 | 34.9552 |
| 2003 | 35.1097 |
| 2004 | 35.4792 |
| 2005 | 34.9756 |
| 2006 | 35.2919 |
| 2007 | 35.7024 |
| 2008 | 36.0806 |
| 2009 | 36.294 |
| 2010 | 36.3739 |
| 2011 | 36.7036 |
| 2012 | 35.9793 |
| 2013 | 36.4859 |
| 2014 | 37.0335 |
| 2015 | 36.5819 |
| 2016 | 37 |
| 2017 | 36 |