| 年度 | 实际值 |
|---|---|
| 1992 | 6.2 |
| 1993 | 6.5 |
| 1994 | |
| 1995 | 4.86 |
| 1996 | 3.25 |
| 1997 | 3.18 |
| 1998 | 5.96 |
| 1999 | 1.65 |
| 2000 | 3 |
| 2001 | 1.02 |
| 2002 | 1.41 |
| 2003 | -.1 |
| 2004 | .49 |
| 2005 | .32 |
| 2006 | 0 |
| 2007 | -.11 |
| 2008 | -.49 |
| 2009 | |
| 2010 | -4.45 |
| 2011 | -.3 |
| 2012 | -5.9 |
| 2013 | -2.6 |
| 2014 | .5 |
| 2015 | -1.71 |
| 2016 | -4.2 |
| 2017 | -11.57 |
| 2018 | -2.81 |