| 年度 | 实际值 |
|---|---|
| 1992 | 5 |
| 1993 | 3.4 |
| 1994 | |
| 1995 | 2.26 |
| 1996 | 2.54 |
| 1997 | 1.79 |
| 1998 | 6.33 |
| 1999 | 1.1 |
| 2000 | 2.02 |
| 2001 | .62 |
| 2002 | .36 |
| 2003 | -.28 |
| 2004 | 1.08 |
| 2005 | .63 |
| 2006 | .17 |
| 2007 | 1.07 |
| 2008 | -.25 |
| 2009 | |
| 2010 | -.18 |
| 2011 | .3 |
| 2012 | 1.4 |
| 2013 | |
| 2014 | 1.3 |
| 2015 | -.51 |
| 2016 | 0.57 |
| 2017 | -0.62 |
| 2018 | -0.58 |