| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.228 | 118 |
| 2015 | 4.481 | 127 |
| 2014 | 4.764 | 135 |
| 2013 | 5.364 | 129 |
| 2012 | 5.747 | 118 |
| 2011 | 6.117 | 113 |
| 2010 | 7.76 | 102 |
| 2009 | 9.386 | 94 |
| 2008 | 8.549 | 106 |
| 2007 | 6.459 | 140 |
| 2006 | 5.032 | 152 |
| 2005 | 4.928 | 147 |
| 2004 | 5.655 | 136 |
| 2003 | 5.506 | 137 |
| 2002 | 6.704 | 130 |
| 2001 | 7.782 | 122 |
| 2000 | 7.434 | 130 |
| 1999 | 11.086 | 107 |
| 1998 | 15.058 | 77 |
| 1997 | 11.761 | 95 |
| 1996 | 14.874 | 79 |
| 1995 | 19.013 | 51 |
| 1994 | 24.654 | 32 |
| 1993 | 33.658 | 21 |
| 1992 | 30.5 | 17 |