| 年度 | 实际值 |
|---|---|
| 1992 | 6.4 |
| 1993 | 5.8 |
| 1994 | |
| 1995 | 4.75 |
| 1996 | 3.18 |
| 1997 | 2.75 |
| 1998 | 5.96 |
| 1999 | 3.08 |
| 2000 | 4.06 |
| 2001 | 2.15 |
| 2002 | 1.81 |
| 2003 | -.04 |
| 2004 | .44 |
| 2005 | |
| 2006 | |
| 2007 | -4.69 |
| 2008 | -1.52 |
| 2009 | |
| 2010 | -2.58 |
| 2011 | -3.9 |
| 2012 | -5 |
| 2013 | -3.8 |
| 2014 | -4.5 |
| 2015 | -5.94 |
| 2016 | -4.54 |
| 2017 | -9.1 |
| 2018 | -5.19 |