| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.592 | 121 |
| 2015 | 0.131 | 155 |
| 2014 | 2.367 | 112 |
| 2013 | 6.422 | 40 |
| 2012 | 3.772 | 97 |
| 2011 | 3.146 | 109 |
| 2010 | 1.34 | 143 |
| 2009 | 0.798 | 95 |
| 2008 | 2.393 | 121 |
| 2007 | 0.564 | 161 |
| 2006 | 1.212 | 151 |
| 2005 | 1.604 | 147 |
| 2004 | 1.166 | 152 |
| 2003 | 1.227 | 132 |
| 2002 | 2.892 | 100 |
| 2001 | 1.573 | 123 |
| 2000 | 1.704 | 133 |
| 1999 | 1.298 | 120 |
| 1998 | 2.904 | 99 |
| 1997 | 3.677 | 91 |
| 1996 | 1.403 | 125 |
| 1995 | 3.687 | 68 |
| 1994 | 4.869 | 47 |
| 1993 | 3.99 | 50 |
| 1992 | 4.062 | 56 |
| 1991 | -.589 | 96 |
| 1990 | 5.973 | 33 |
| 1989 | 1.235 | 80 |
| 1988 | 13.305 | 5 |
| 1987 | -.699 | 92 |