| 年度 | 实际值 |
|---|---|
| 1992 | 5.6 |
| 1993 | 6.2 |
| 1994 | |
| 1995 | 6.03 |
| 1996 | 3.76 |
| 1997 | 2.83 |
| 1998 | 6.41 |
| 1999 | 2.45 |
| 2000 | 4.75 |
| 2001 | 2.77 |
| 2002 | 3.01 |
| 2003 | 2.13 |
| 2004 | -3.06 |
| 2005 | -3.72 |
| 2006 | 2.95 |
| 2007 | 3.14 |
| 2008 | 2.93 |
| 2009 | 1.49 |
| 2010 | -.23 |
| 2011 | 1.75 |
| 2012 | -2.7 |
| 2013 | .83 |
| 2014 | 2.31 |
| 2015 | .12 |
| 2016 | 2.31 |
| 2017 | -8.05 |
| 2018 | 1.24 |