| 年度 | 实际值 |
|---|---|
| 1992 | 3.9 |
| 1993 | 3.6 |
| 1994 | |
| 1995 | 3.32 |
| 1996 | 2.77 |
| 1997 | 2.22 |
| 1998 | 6.03 |
| 1999 | 0 |
| 2000 | 1.82 |
| 2001 | 1.4 |
| 2002 | 2.63 |
| 2003 | -.53 |
| 2004 | |
| 2005 | 1.26 |
| 2006 | 1.13 |
| 2007 | 1.65 |
| 2008 | 1.22 |
| 2009 | |
| 2010 | -1.14 |
| 2011 | 2.2 |
| 2012 | 1.2 |
| 2013 | .2 |
| 2014 | 3.4 |
| 2015 | .2 |
| 2016 | 2.73 |
| 2017 | -2.22 |
| 2018 | 0.32 |