| 年度 | 实际值 |
|---|---|
| 1992 | 4.2 |
| 1993 | 4.4 |
| 1994 | |
| 1995 | 5.31 |
| 1996 | 7.88 |
| 1997 | 4.07 |
| 1998 | 4.32 |
| 1999 | 4.05 |
| 2000 | 3.45 |
| 2001 | 2.59 |
| 2002 | 2.31 |
| 2003 | -.26 |
| 2004 | 1.66 |
| 2005 | 1.12 |
| 2006 | .79 |
| 2007 | .85 |
| 2008 | .48 |
| 2009 | |
| 2010 | .06 |
| 2011 | -.4 |
| 2012 | 1.1 |
| 2013 | |
| 2014 | .1 |
| 2015 | -2.08 |
| 2016 | 0.02 |
| 2017 | -3.67 |
| 2018 | -2.49 |