| 年度 | 实际值 |
|---|---|
| 1992 | 3 |
| 1993 | 1.6 |
| 1994 | |
| 1995 | 1.25 |
| 1996 | .15 |
| 1997 | -1.69 |
| 1998 | 6.15 |
| 1999 | 1 |
| 2000 | -.04 |
| 2001 | 2.19 |
| 2002 | 1.98 |
| 2003 | .65 |
| 2004 | .83 |
| 2005 | 1.48 |
| 2006 | 3.04 |
| 2007 | 3.35 |
| 2008 | 3.76 |
| 2009 | |
| 2010 | 3.14 |
| 2011 | 4.2 |
| 2012 | -8.4 |
| 2013 | 4.7 |
| 2014 | 6.6 |
| 2015 | 3.59 |
| 2016 | 6.52 |
| 2017 | -7.2 |
| 2018 | 3.59 |