| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.14 | 65 |
| 2015 | 2.757 | 96 |
| 2014 | 2.34 | 114 |
| 2013 | 2.686 | 106 |
| 2012 | 3.23 | 106 |
| 2011 | 2.529 | 127 |
| 2010 | 2.161 | 125 |
| 2009 | 2 | 80 |
| 2008 | 3.71 | 102 |
| 2007 | 4.227 | 130 |
| 2006 | 3.2 | 132 |
| 2005 | 3.536 | 120 |
| 2004 | 4.555 | 98 |
| 2003 | 2.893 | 111 |
| 2002 | 3.94 | 79 |
| 2001 | 3.223 | 93 |
| 2000 | 3.991 | 97 |
| 1999 | 5.704 | 37 |
| 1998 | 4.094 | 77 |
| 1997 | 5.003 | 68 |
| 1996 | 3.686 | 77 |
| 1995 | 4.515 | 54 |
| 1994 | 4.292 | 51 |
| 1993 | 3.842 | 52 |
| 1992 | 0.67 | 99 |
| 1991 | 0.492 | 86 |
| 1990 | 4.459 | 50 |
| 1989 | 4.63 | 43 |
| 1988 | 6.016 | 32 |
| 1987 | 3.179 | 70 |
| 1986 | 4.543 | 40 |