| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 20.24 | 12 |
| 2015 | 19.25 | 22 |
| 2014 | 13.76 | 46 |
| 2013 | 24.46 | 9 |
| 2012 | 11.36 | 68 |
| 2011 | 14.5 | 59 |
| 2010 | 30.13 | 14 |
| 2009 | 7.73 | 101 |
| 2008 | 7.88 | 124 |
| 2007 | 46.4 | 11 |
| 2006 | 42.74 | 15 |
| 2005 | 27.85 | 33 |
| 2004 | 40.03 | 11 |
| 2003 | 23.06 | 35 |
| 2002 | 18.81 | 51 |
| 2001 | 19.43 | 65 |
| 2000 | 39.17 | 24 |
| 1999 | 20.57 | 43 |
| 1998 | -.79 | 140 |
| 1997 | 42.78 | 17 |
| 1996 | 40.23 | 18 |