| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.94 | 59 |
| 2015 | 3.99 | 32 |
| 2014 | 5 | 11 |
| 2013 | 5.82 | 6 |
| 2012 | 6.23 | 5 |
| 2011 | 6.25 | 4 |
| 2010 | 6.18 | 5 |
| 2009 | 6.11 | 6 |
| 2008 | 5.79 | 8 |
| 2007 | 5.19 | 14 |
| 2006 | 4.34 | 29 |
| 2005 | 3.08 | 70 |
| 2004 | 1.79 | 109 |
| 2003 | 1.19 | 135 |
| 2002 | 1.64 | 123 |
| 2001 | 2.83 | 76 |
| 2000 | 4.69 | 17 |
| 1999 | 6.38 | 6 |
| 1998 | 6.83 | 3 |
| 1997 | 5.01 | 15 |
| 1996 | 1.32 | 136 |
| 1991 | -3.08 | 209 |
| 1990 | 0.14 | 193 |
| 1989 | 2.82 | 100 |
| 1988 | 4.84 | 42 |
| 1987 | 5.66 | 27 |
| 1986 | 5.45 | 34 |