| 年度 | 实际值 |
|---|---|
| 1992 | 2.5 |
| 1993 | 2.1 |
| 1994 | |
| 1995 | 3.27 |
| 1996 | 3.52 |
| 1997 | 2.49 |
| 1998 | 7.26 |
| 1999 | .74 |
| 2000 | 1.17 |
| 2001 | .25 |
| 2002 | .79 |
| 2003 | -1.07 |
| 2004 | 1.41 |
| 2005 | .76 |
| 2006 | 1.06 |
| 2007 | .44 |
| 2008 | -.96 |
| 2009 | |
| 2010 | -2.43 |
| 2011 | -.2 |
| 2012 | -1.7 |
| 2013 | .6 |
| 2014 | 3.3 |
| 2015 | -.3 |
| 2016 | 2.78 |
| 2017 | -1.81 |
| 2018 | 0.17 |