| 年度 | 实际值 |
|---|---|
| 1992 | 5.3 |
| 1993 | 4.7 |
| 1994 | |
| 1995 | 4.92 |
| 1996 | 6.08 |
| 1997 | 5.38 |
| 1998 | 3.8 |
| 1999 | 5.25 |
| 2000 | 3.89 |
| 2001 | 4.79 |
| 2002 | 4.14 |
| 2003 | 1.67 |
| 2004 | 2.62 |
| 2005 | |
| 2006 | 3.99 |
| 2007 | 3.71 |
| 2008 | 2.77 |
| 2009 | |
| 2010 | .08 |
| 2011 | -1.3 |
| 2012 | |
| 2013 | 1.2 |
| 2014 | .2 |
| 2015 | -.25 |
| 2016 | 0.65 |
| 2017 | -8.95 |
| 2018 | -0.74 |