| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.33 | 36 |
| 2015 | 1.26 | 110 |
| 2014 | -1.37 | 172 |
| 2013 | 3.07 | 66 |
| 2012 | -.53 | 153 |
| 2011 | 2.21 | 104 |
| 2010 | 0.99 | 142 |
| 2009 | -2.73 | 120 |
| 2008 | 5.82 | 32 |
| 2007 | 6.32 | 55 |
| 2006 | 5.32 | 70 |
| 2005 | 5.86 | 43 |
| 2004 | 9.3 | 17 |
| 2003 | 4.64 | 57 |
| 2002 | 7.21 | 16 |
| 2001 | 5.17 | 32 |
| 2000 | 8.1 | 14 |
| 1999 | -11.83 | 194 |
| 1998 | 2.82 | 90 |
| 1997 | 7.49 | 23 |
| 1996 | 2.53 | 96 |