| 年度 | 实际值 |
|---|---|
| 1992 | 4 |
| 1993 | 3.9 |
| 1994 | |
| 1995 | 3.52 |
| 1996 | 3.57 |
| 1997 | 1.51 |
| 1998 | 7.63 |
| 1999 | -.35 |
| 2000 | 1.06 |
| 2001 | 1.4 |
| 2002 | -.03 |
| 2003 | -1.4 |
| 2004 | .56 |
| 2005 | -.74 |
| 2006 | |
| 2007 | -.48 |
| 2008 | -.91 |
| 2009 | |
| 2010 | -.75 |
| 2011 | .7 |
| 2012 | 5.5 |
| 2013 | 1.8 |
| 2014 | 3.9 |
| 2015 | -.25 |
| 2016 | 2.19 |
| 2017 | 2.11 |
| 2018 | 1.26 |