| 年度 | 实际值 |
|---|---|
| 1992 | 2.3 |
| 1993 | 2.4 |
| 1994 | |
| 1995 | 1.58 |
| 1996 | 2.36 |
| 1997 | 1.24 |
| 1998 | 6.36 |
| 1999 | .96 |
| 2000 | 2.29 |
| 2001 | 1.16 |
| 2002 | .4 |
| 2003 | -.84 |
| 2004 | .59 |
| 2005 | -.03 |
| 2006 | .62 |
| 2007 | 1.4 |
| 2008 | 1.79 |
| 2009 | |
| 2010 | 1.39 |
| 2011 | 1.3 |
| 2012 | -.6 |
| 2013 | 2.1 |
| 2014 | 2.3 |
| 2015 | -.26 |
| 2016 | 2.2 |
| 2017 | -6.64 |
| 2018 | 0.32 |