| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.79 | 36 |
| 2015 | 2.48 | 13 |
| 2014 | 3.18 | 6 |
| 2013 | 3.71 | 5 |
| 2012 | 3.93 | 5 |
| 2011 | 3.88 | 5 |
| 2010 | 3.73 | 7 |
| 2009 | 3.55 | 8 |
| 2008 | 3.25 | 9 |
| 2007 | 2.85 | 17 |
| 2006 | 2.36 | 24 |
| 2005 | 1.76 | 50 |
| 2004 | 1.13 | 78 |
| 2003 | 0.64 | 104 |
| 2002 | 0.39 | 117 |
| 2001 | 0.36 | 111 |
| 2000 | 0.35 | 113 |
| 1999 | 0.36 | 116 |
| 1998 | 0.58 | 100 |
| 1997 | 1.05 | 81 |
| 1996 | 1.72 | 60 |
| 1995 | 1.1 | 82 |
| 1994 | 0.16 | 127 |
| 1993 | 0.84 | 99 |
| 1992 | 1.04 | 93 |
| 1991 | 0.82 | 104 |
| 1990 | 0.38 | 128 |
| 1989 | -.02 | 141 |
| 1988 | -.33 | 148 |
| 1987 | -.36 | 149 |
| 1986 | -.17 | 149 |