| 年度 | 实际值 |
|---|---|
| 1992 | 32.2 |
| 1993 | |
| 1994 | |
| 1995 | 32.7 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 34.54 |
| 2000 | 346974 |
| 2001 | 348686 |
| 2002 | 32.3192 |
| 2003 | 35.1338 |
| 2004 | 35.1749 |
| 2005 | 35.1964 |
| 2006 | 35.05 |
| 2007 | 35.34 |
| 2008 | 35.89 |
| 2009 | 36.1294 |
| 2010 | 36.6147 |
| 2011 | 36.746 |
| 2012 | 37 |
| 2013 | 37.39 |
| 2014 | 37.84 |
| 2015 | 38.18 |
| 2016 | 35.58 |