| 年度 | 实际值 |
|---|---|
| 1992 | 5.7 |
| 1993 | 4.9 |
| 1994 | |
| 1995 | 4.03 |
| 1996 | 3.11 |
| 1997 | 2.76 |
| 1998 | 5.87 |
| 1999 | -.69 |
| 2000 | .23 |
| 2001 | .65 |
| 2002 | 1.44 |
| 2003 | -.18 |
| 2004 | .11 |
| 2005 | |
| 2006 | |
| 2007 | -.44 |
| 2008 | -1.31 |
| 2009 | |
| 2010 | -1.72 |
| 2011 | -5.1 |
| 2012 | -2.6 |
| 2013 | -3.9 |
| 2014 | -1.1 |
| 2015 | -6.35 |
| 2016 | -1.95 |
| 2017 | -10.65 |
| 2018 | -4.63 |