| 年度 | 实际值 |
|---|---|
| 1996 | 3.26 |
| 1997 | 1.58 |
| 1998 | 6.88 |
| 1999 | 1.88 |
| 2000 | 1.54 |
| 2001 | 1.95 |
| 2002 | 1.42 |
| 2003 | .96 |
| 2004 | -.0382 |
| 2005 | 1.58635377480544 |
| 2006 | 1.81196241237011 |
| 2007 | -2.76490289931454 |
| 2008 | 1.99761799429688 |
| 2009 | 2.0511901918637 |
| 2010 | -1.92 |
| 2011 | 2.9 |
| 2012 | -2.6 |
| 2013 | 1.4 |
| 2014 | 1.1 |
| 2015 | .83 |
| 2016 | 1.94 |
| 2017 | -2.97 |
| 2018 | -0.06 |