| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.57 | 146 |
| 2015 | 1.53 | 100 |
| 2014 | 4.72 | 23 |
| 2013 | 2.88 | 70 |
| 2012 | 3.56 | 51 |
| 2011 | 2.27 | 102 |
| 2010 | 3.72 | 75 |
| 2009 | 3.5 | 24 |
| 2008 | 5.06 | 47 |
| 2007 | 2.33 | 137 |
| 2006 | 2.17 | 139 |
| 2005 | 2.14 | 133 |
| 2004 | 3.2 | 107 |
| 2003 | 2.34 | 107 |
| 2002 | -1.53 | 163 |
| 2001 | 2.97 | 63 |
| 2000 | 4.25 | 61 |
| 1999 | 2.4 | 84 |
| 1998 | 0.91 | 128 |
| 1997 | 2.77 | 96 |
| 1996 | 2.89 | 90 |
| 1995 | 0.91 | 130 |
| 1994 | 5.38 | 29 |
| 1993 | 1.05 | 87 |
| 1992 | 1.32 | 73 |
| 1991 | 3.63 | 36 |
| 1990 | 2.09 | 70 |
| 1989 | 1.94 | 80 |
| 1988 | 5.33 | 41 |
| 1987 | -.51 | 115 |
| 1986 | 2.26 | 70 |