| 年度 | 实际值 |
|---|---|
| 1992 | 9.8 |
| 1993 | 12 |
| 1994 | |
| 1995 | 11.06 |
| 1996 | 10.57 |
| 1997 | 9.85 |
| 1998 | 5.07 |
| 1999 | 6.64 |
| 2000 | 7.26 |
| 2001 | 6.07 |
| 2002 | 6.18 |
| 2003 | 6.97 |
| 2004 | 7.12 |
| 2005 | 6.14 |
| 2006 | 13.67 |
| 2007 | 6.48 |
| 2008 | -1.59 |
| 2009 | |
| 2010 | 5.02 |
| 2011 | 1.5 |
| 2012 | 7.4 |
| 2013 | 3.7 |
| 2014 | 7.7 |
| 2015 | 6.77 |
| 2016 | 9.12 |
| 2017 | 7.12 |
| 2018 | -2.28 |