| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.718 | 112 |
| 2015 | 3.423 | 139 |
| 2014 | 3.552 | 145 |
| 2013 | 4.248 | 144 |
| 2012 | 4.731 | 144 |
| 2011 | 4.916 | 141 |
| 2010 | 5.287 | 139 |
| 2009 | 7.074 | 115 |
| 2008 | 8.706 | 102 |
| 2007 | 7.561 | 125 |
| 2006 | 7.512 | 124 |
| 2005 | 9.695 | 94 |
| 2004 | 7.438 | 117 |
| 2003 | 7.023 | 116 |
| 2002 | 8.211 | 112 |
| 2001 | 12.795 | 82 |
| 2000 | 16.928 | 62 |
| 1999 | 23.743 | 37 |
| 1998 | 26.358 | 33 |
| 1997 | 22.14 | 37 |
| 1996 | 36.386 | 22 |
| 1995 | 59.432 | 9 |
| 1994 | 19.3 | 42 |
| 1993 | 17.73 | 45 |