| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.77 | 90 |
| 2015 | 2.42 | 113 |
| 2014 | 2.61 | 113 |
| 2013 | 2.57 | 115 |
| 2012 | 3.63 | 94 |
| 2011 | 2.37 | 130 |
| 2010 | 2.01 | 146 |
| 2009 | 1.81 | 77 |
| 2008 | 3.7 | 99 |
| 2007 | 3.75 | 136 |
| 2006 | 2.98 | 157 |
| 2005 | 3.2 | 142 |
| 2004 | 4.15 | 129 |
| 2003 | 3.07 | 125 |
| 2002 | 3.85 | 82 |
| 2001 | 1.93 | 133 |
| 2000 | 3.87 | 113 |
| 1999 | 5.01 | 50 |
| 1998 | 4.44 | 77 |
| 1997 | 3.95 | 108 |
| 1996 | 3.95 | 104 |
| 1995 | 3.89 | 102 |
| 1994 | 4.05 | 77 |
| 1993 | 4.06 | 68 |
| 1992 | 0.44 | 118 |
| 1991 | -.38 | 126 |
| 1990 | 3.53 | 81 |
| 1989 | 3.88 | 83 |
| 1988 | 5.78 | 63 |
| 1987 | 2.58 | 97 |
| 1986 | 4.1 | 70 |