| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.84 | 48 |
| 2015 | 3.56 | 40 |
| 2014 | 3.09 | 65 |
| 2013 | 3.73 | 48 |
| 2012 | 5.3 | 28 |
| 2011 | 8.34 | 14 |
| 2010 | -1.77 | 178 |
| 2009 | -12.91 | 192 |
| 2008 | -2.59 | 183 |
| 2007 | 10.85 | 12 |
| 2006 | 12.92 | 6 |
| 2005 | 11.9 | 7 |
| 2004 | 9.52 | 14 |
| 2003 | 9.48 | 13 |
| 2002 | 8.35 | 10 |
| 2001 | 7.85 | 13 |
| 2000 | 6.43 | 29 |
| 1999 | 3.46 | 61 |
| 1998 | 7.53 | 18 |
| 1997 | 10.07 | 10 |
| 1996 | 3.52 | 75 |