| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.823 | 62 |
| 2015 | 2.515 | 74 |
| 2014 | 1.859 | 113 |
| 2013 | 2.07 | 113 |
| 2012 | 2.42 | 117 |
| 2011 | 3.747 | 81 |
| 2010 | 5.415 | 60 |
| 2009 | 4.913 | 75 |
| 2008 | 2.754 | 136 |
| 2007 | 7.045 | 52 |
| 2006 | 5.557 | 63 |
| 2005 | 1.827 | 147 |
| 2004 | 1.722 | 135 |
| 2003 | 1.911 | 133 |
| 2002 | 2.29 | 130 |
| 2001 | 2.685 | 133 |
| 2000 | 3.115 | 129 |
| 1999 | 3.358 | 128 |
| 1998 | 4.534 | 117 |
| 1997 | 5.563 | 99 |
| 1996 | 6.207 | 95 |
| 1995 | 6.773 | 87 |
| 1994 | 7.145 | 78 |
| 1993 | 7.633 | 76 |