| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.4 | 121 |
| 2015 | 0.773 | 132 |
| 2014 | 1.592 | 119 |
| 2013 | 2.131 | 110 |
| 2012 | 3.007 | 99 |
| 2011 | 3.518 | 82 |
| 2010 | 1.713 | 130 |
| 2009 | 1.986 | 133 |
| 2008 | 4.214 | 98 |
| 2007 | 3.668 | 121 |
| 2006 | 2.496 | 142 |
| 2005 | 1.87 | 144 |
| 2004 | 1.82 | 131 |
| 2003 | 1.991 | 131 |
| 1999 | 2.4 | 139 |
| 1998 | 3.367 | 131 |
| 1997 | 4.558 | 116 |
| 1996 | 6.317 | 94 |
| 1995 | 8.383 | 74 |
| 1994 | 8.367 | 66 |
| 1993 | 11.058 | 49 |
| 1992 | 14.592 | 37 |
| 1991 | 14.8 | 35 |
| 1990 | 13.992 | 33 |
| 1989 | 13 | 33 |
| 1988 | 13.208 | 29 |
| 1987 | 14.458 | 22 |
| 1986 | 17.125 | 14 |