| 年度 | 实际值 |
|---|---|
| 1992 | 1.9 |
| 1993 | 1 |
| 1994 | |
| 1995 | .79 |
| 1996 | .21 |
| 1997 | .14 |
| 1998 | 6.11 |
| 1999 | -.41 |
| 2000 | -.53 |
| 2001 | .39 |
| 2002 | .55 |
| 2003 | -1.16 |
| 2004 | .32 |
| 2005 | .64 |
| 2006 | 2.08 |
| 2007 | 4.07 |
| 2008 | 4.44 |
| 2009 | |
| 2010 | 3.91 |
| 2011 | 5.8 |
| 2012 | 7 |
| 2013 | 6.2 |
| 2014 | 7.4 |
| 2015 | 3.91 |
| 2016 | 8.53 |
| 2017 | -5.79 |
| 2018 | 4.07 |