| 年度 | 实际值 |
|---|---|
| 1992 | 14.3 |
| 1993 | 11.5 |
| 1994 | |
| 1995 | 9.93 |
| 1996 | 10.02 |
| 1997 | 9.84 |
| 1998 | 5.08 |
| 1999 | 9.54 |
| 2000 | 10.64 |
| 2001 | 8.39 |
| 2002 | 8 |
| 2003 | 3.2 |
| 2004 | 1.4 |
| 2005 | -.19 |
| 2006 | 3.92 |
| 2007 | 6.09 |
| 2008 | 5.78 |
| 2009 | |
| 2010 | -.38 |
| 2011 | 5.9 |
| 2012 | 5.4 |
| 2013 | 4.4 |
| 2014 | 5.6 |
| 2015 | 3.21 |
| 2016 | 2.59 |
| 2017 | -1.43 |
| 2018 | 0.76 |