| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 14.58 | 28 |
| 2015 | 14.9 | 39 |
| 2014 | 3.02 | 139 |
| 2013 | 22.76 | 12 |
| 2012 | 23.83 | 16 |
| 2011 | 14.91 | 55 |
| 2010 | 21.15 | 39 |
| 2009 | 22.22 | 30 |
| 2008 | 7.75 | 126 |
| 2007 | 35.4 | 30 |
| 2006 | 50.18 | 9 |
| 2005 | 9.9 | 116 |
| 2004 | 32.07 | 19 |
| 2003 | 33.36 | 18 |
| 2002 | 33.88 | 21 |
| 2001 | 11.31 | 93 |
| 2000 | 11.72 | 90 |
| 1999 | 33.68 | 17 |
| 1998 | 17.53 | 40 |
| 1997 | 32.18 | 26 |
| 1996 | 14.8 | 80 |