| 年度 | 实际值 |
|---|---|
| 1992 | 10.5 |
| 1993 | |
| 1994 | |
| 1995 | 10.9 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 11.9335 |
| 2000 | 12.0191 |
| 2001 | 12.054 |
| 2002 | 12.1545 |
| 2003 | 12.2971 |
| 2004 | 12.334 |
| 2005 | 12.2676 |
| 2006 | 12.3798 |
| 2007 | 12.398 |
| 2008 | 12.253 |
| 2009 | 12.06 |
| 2010 | 12.4219 |
| 2011 | 12.3261 |
| 2012 | 12.2883 |
| 2013 | 12.2482 |
| 2014 | 11.6779 |
| 2015 | 11.6346 |
| 2016 | 12 |
| 2017 | 11 |