| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.59 | 39 |
| 2015 | 2.98 | 49 |
| 2014 | 2.85 | 41 |
| 2013 | -.65 | 128 |
| 2012 | -5.11 | 153 |
| 2011 | -3.46 | 144 |
| 2010 | 2.35 | 76 |
| 2009 | -2.43 | 110 |
| 2008 | 1.23 | 91 |
| 2007 | 2.32 | 94 |
| 2006 | 1.32 | 108 |
| 2005 | 1.4 | 114 |
| 2004 | 2.31 | 95 |
| 2003 | -.65 | 118 |
| 2002 | 0.76 | 94 |
| 2001 | 0.24 | 101 |
| 2000 | 2.96 | 53 |
| 1999 | 4.66 | 29 |
| 1998 | 4.26 | 43 |
| 1997 | 2.88 | 59 |
| 1996 | 3.13 | 64 |
| 1995 | 0.25 | 84 |
| 1994 | 0.75 | 71 |
| 1993 | 0.98 | 60 |
| 1992 | 4.82 | 21 |
| 1991 | 4.47 | 27 |
| 1990 | 6.67 | 12 |
| 1989 | 3.09 | 33 |
| 1988 | 6.94 | 15 |
| 1987 | 5.31 | 18 |
| 1986 | 5.54 | 20 |