| 年度 | 实际值 |
|---|---|
| 1992 | 4.7 |
| 1993 | 4.1 |
| 1994 | |
| 1995 | 1.09 |
| 1996 | 4.52 |
| 1997 | 4.36 |
| 1998 | 3.8 |
| 1999 | 1.62 |
| 2000 | 4.46 |
| 2001 | 2.94 |
| 2002 | 2.64 |
| 2003 | -.13 |
| 2004 | .25 |
| 2005 | |
| 2006 | .32 |
| 2007 | .85 |
| 2008 | -.05 |
| 2009 | |
| 2010 | .13 |
| 2011 | -1.5 |
| 2012 | -9.1 |
| 2013 | -1.1 |
| 2014 | .5 |
| 2015 | -1.65 |
| 2016 | -0.18 |
| 2017 | -7.99 |
| 2018 | -1.68 |