| 年度 | 实际值 |
|---|---|
| 1992 | 10.6 |
| 1993 | |
| 1994 | |
| 1995 | 9.8 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 9.8 |
| 2000 | 9.8435 |
| 2001 | 9.9042 |
| 2002 | 9.8819 |
| 2003 | 9.8897 |
| 2004 | 9.9402 |
| 2005 | 10.94 |
| 2006 | 10.85 |
| 2007 | 10.24 |
| 2008 | 10.24 |
| 2009 | 10.2569 |
| 2010 | 10.0258 |
| 2011 | 10.0435 |
| 2012 | 9.992 |
| 2013 | 9.9512 |
| 2014 | 10.65 |
| 2015 | 10.6816594563015 |
| 2016 | 10 |
| 2017 | 9 |