| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.448 | 73 |
| 2015 | 1.612 | 107 |
| 2014 | 1.352 | 127 |
| 2013 | 1.418 | 130 |
| 2012 | 1.667 | 129 |
| 2011 | 1.748 | 131 |
| 2010 | 2.899 | 107 |
| 2009 | 4.237 | 84 |
| 2008 | 2.965 | 133 |
| 2007 | 4.425 | 95 |
| 2006 | 4.232 | 96 |
| 2005 | 3.185 | 104 |
| 2004 | 3.2 | 102 |
| 1999 | 6.5 | 84 |
| 1998 | 6.563 | 93 |
| 1997 | 6.625 | 88 |
| 1996 | 6.5 | 92 |
| 1995 | 6.188 | 92 |
| 1994 | 4.842 | 99 |
| 1993 | 4.075 | 108 |
| 1992 | 4.75 | 97 |
| 1991 | 6 | 88 |
| 1990 | 6 | 93 |
| 1989 | 6 | 85 |
| 1988 | 6 | 80 |
| 1987 | 6 | 74 |
| 1986 | 6 | 81 |