| 年度 | 实际值 |
|---|---|
| 1992 | 6.8 |
| 1993 | |
| 1994 | |
| 1995 | 7.6 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 10.9285 |
| 2000 | 11.511 |
| 2001 | 11.0436 |
| 2002 | 11.0265 |
| 2003 | 10.7907 |
| 2004 | 11.2506 |
| 2005 | 11.6651 |
| 2006 | 10.9027 |
| 2007 | 10.6453 |
| 2008 | 11.4441 |
| 2009 | 10.8618 |
| 2010 | 10.4928 |
| 2011 | 12.2509 |
| 2012 | 12.2521 |
| 2013 | 11.5644 |
| 2014 | 11.722 |
| 2015 | 12.9182 |