| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.726 | 12 |
| 2015 | 11.971 | 12 |
| 2014 | 5.717 | 49 |
| 2013 | 7.228 | 32 |
| 2012 | 7.632 | 44 |
| 2011 | 7.573 | 39 |
| 2010 | 7.669 | 39 |
| 2009 | 14.943 | 7 |
| 2008 | 17.934 | 2 |
| 2007 | 15.01 | 4 |
| 2006 | 11.88 | 8 |
| 2005 | 13.215 | 8 |
| 2004 | 15.115 | 8 |
| 2003 | 12.551 | 18 |
| 2002 | 14.2 | 19 |
| 2001 | 20.933 | 9 |
| 2000 | 24.867 | 9 |
| 1999 | 27.542 | 7 |
| 1998 | 21.675 | 19 |
| 1997 | 23.467 | 18 |
| 1996 | 25.425 | 20 |