| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.525 | 119 |
| 2015 | 0.452 | 138 |
| 2014 | 0.565 | 146 |
| 2013 | 1.084 | 137 |
| 2012 | 1.923 | 125 |
| 2011 | 2.482 | 111 |
| 2010 | 1.851 | 122 |
| 2009 | 1.107 | 152 |
| 2008 | 2.31 | 144 |
| 2007 | 3.496 | 128 |
| 2006 | 4.31 | 95 |
| 2005 | 3.662 | 93 |
| 2004 | 3.514 | 94 |
| 2003 | 4.517 | 83 |
| 2002 | 8.099 | 45 |
| 2001 | 4.919 | 93 |
| 2000 | 7.558 | 70 |
| 1999 | 10.488 | 50 |
| 1998 | 12.46 | 46 |
| 1997 | 12.64 | 45 |
| 1996 | 14.61 | 42 |
| 1995 | 13.84 | 42 |