| 年度 | 实际值 |
|---|---|
| 1992 | 34.43 |
| 1993 | 35.47 |
| 1994 | 36.11 |
| 1995 | 36.93 |
| 1996 | 37.52 |
| 1997 | 37.52 |
| 1998 | 41.97 |
| 1999 | 42.41 |
| 2000 | 42.94 |
| 2001 | 43.08 |
| 2002 | 43.35 |
| 2003 | 43.4 |
| 2004 | 43.55 |
| 2005 | 43.91 |
| 2006 | 44.25 |
| 2007 | 44.5 |
| 2008 | 44.6 |
| 2009 | |
| 2010 | 44.69 |
| 2011 | 44.6 |
| 2012 | 44.1 |
| 2013 | 43.9 |
| 2014 | 43.8 |
| 2015 | 43.52 |
| 2016 | 43 |
| 2017 | 162 |
| 2018 | 43 |