| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.712 | 27 |
| 2015 | 4.312 | 59 |
| 2014 | 4.459 | 74 |
| 2013 | 5.133 | 63 |
| 2012 | 4.397 | 85 |
| 2011 | 3.94 | 93 |
| 2010 | 3.206 | 109 |
| 2009 | 1.331 | 89 |
| 2008 | 4.938 | 73 |
| 2007 | 5.584 | 105 |
| 2006 | 6.275 | 81 |
| 2005 | 8.708 | 36 |
| 2004 | 5.841 | 74 |
| 2003 | 5.216 | 62 |
| 2002 | 4.763 | 66 |
| 2001 | 3.09 | 95 |
| 2000 | 4.152 | 95 |
| 1999 | 4.991 | 54 |
| 1998 | 1.645 | 120 |
| 1997 | 3.611 | 93 |
| 1996 | 4.992 | 59 |
| 1995 | 4.798 | 51 |
| 1994 | 4.202 | 53 |
| 1993 | 4.634 | 47 |
| 1992 | 6.759 | 29 |
| 1991 | 5.21 | 37 |
| 1990 | 4.478 | 48 |
| 1989 | 3.81 | 58 |
| 1988 | 6.767 | 25 |
| 1987 | 5.862 | 36 |
| 1986 | 5.77 | 28 |