| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.312 | 129 |
| 2015 | 0.378 | 143 |
| 2014 | 0.578 | 145 |
| 2013 | 0.73 | 143 |
| 2012 | 1.252 | 137 |
| 2011 | 1.648 | 134 |
| 2010 | 1.079 | 147 |
| 2009 | 1.561 | 140 |
| 2008 | 4.267 | 97 |
| 2007 | 3.86 | 112 |
| 2006 | 2.733 | 133 |
| 2005 | 1.963 | 138 |
| 2004 | 1.908 | 128 |
| 2003 | 2.083 | 126 |
| 1999 | 2.206 | 141 |
| 1998 | 2.651 | 144 |
| 1997 | 1.5 | 142 |
| 1996 | 1.708 | 138 |
| 1995 | 2.188 | 134 |
| 1994 | 2.313 | 127 |
| 1993 | 2.98 | 119 |
| 1992 | 3.688 | 109 |
| 1991 | 3.75 | 110 |
| 1990 | 3.41 | 109 |
| 1989 | 2.98 | 109 |
| 1988 | 2.734 | 108 |
| 1987 | 3.033 | 103 |
| 1986 | 3.625 | 103 |