| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.939 | 13 |
| 2015 | 8.91 | 21 |
| 2014 | 8.426 | 24 |
| 2013 | 9.727 | 20 |
| 2012 | 10.706 | 16 |
| 2011 | 11.538 | 12 |
| 2010 | 10.062 | 17 |
| 2009 | 10.81 | 18 |
| 2008 | 11.239 | 18 |
| 2007 | 10.194 | 22 |
| 2006 | 10.132 | 19 |
| 2005 | 7.482 | 44 |
| 2004 | 7.075 | 44 |
| 2003 | 8.83 | 38 |
| 2002 | 5.89 | 65 |
| 2001 | 4.83 | 98 |
| 2000 | 4 | 115 |
| 1999 | 5.333 | 94 |
| 1998 | 9.083 | 65 |
| 1997 | 16.289 | 30 |
| 1996 | 14.705 | 41 |