| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 9.897 | 14 |
| 2014 | 9.855 | 17 |
| 2013 | 9.818 | 19 |
| 2012 | 9.512 | 27 |
| 2011 | 6.777 | 44 |
| 2010 | 6.566 | 46 |
| 2009 | 7.972 | 45 |
| 2008 | 8.253 | 45 |
| 2007 | 8.68 | 27 |
| 2006 | 6.727 | 51 |
| 2005 | 4.733 | 74 |
| 2004 | 4.201 | 76 |
| 2003 | 3.048 | 108 |
| 2002 | 3.289 | 108 |
| 2001 | 4.811 | 99 |
| 2000 | 7.387 | 74 |
| 1999 | 7.75 | 76 |
| 1998 | 7.753 | 82 |
| 1997 | 7.833 | 77 |
| 1996 | 13.592 | 47 |
| 1995 | 24.625 | 23 |
| 1989 | 17 | 26 |
| 1988 | 17.458 | 16 |
| 1987 | 15.75 | 16 |
| 1986 | 8.5 | 52 |