| 年度 | 实际值 |
|---|---|
| 1992 | 13.4 |
| 1993 | |
| 1994 | |
| 1995 | 13.6 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 13.29 |
| 2000 | 132878 |
| 2001 | 132254 |
| 2002 | 9.7947 |
| 2003 | 9.9785 |
| 2004 | 9.6542 |
| 2005 | 9.6569 |
| 2006 | 9.66 |
| 2007 | 9.74 |
| 2008 | 9.8 |
| 2009 | 9.8457 |
| 2010 | 9.9388 |
| 2011 | 9.9686 |
| 2012 | 9.92 |
| 2013 | 10.09 |
| 2014 | 10.19 |
| 2015 | 10.25 |
| 2016 | 9.63 |