| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.33 | 97 |
| 2015 | 1.01 | 112 |
| 2014 | 1.11 | 122 |
| 2013 | 0.84 | 129 |
| 2012 | 1.86 | 86 |
| 2011 | 0.96 | 139 |
| 2010 | 0.43 | 153 |
| 2009 | -.26 | 80 |
| 2008 | 1.64 | 112 |
| 2007 | 3.1 | 121 |
| 2006 | 1.47 | 161 |
| 2005 | 1.85 | 142 |
| 2004 | 2.95 | 116 |
| 2003 | 1.8 | 122 |
| 2002 | 2.59 | 73 |
| 2001 | 0.56 | 130 |
| 2000 | 2.64 | 108 |
| 1999 | 3.81 | 51 |
| 1998 | 3.36 | 72 |
| 1997 | 2.79 | 95 |
| 1996 | 2.59 | 95 |
| 1995 | 2.64 | 81 |
| 1994 | 2.96 | 68 |
| 1993 | 3.05 | 52 |
| 1992 | -.77 | 110 |
| 1991 | -1.64 | 119 |
| 1990 | 2.01 | 72 |
| 1989 | 2.14 | 75 |
| 1988 | 4.06 | 59 |
| 1987 | 1.03 | 91 |
| 1986 | 2.41 | 66 |