| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.53 | 76 |
| 2015 | 1.41 | 96 |
| 2014 | 1.16 | 103 |
| 2013 | 1.47 | 98 |
| 2012 | 1.61 | 100 |
| 2011 | 1.03 | 99 |
| 2010 | 1.27 | 101 |
| 2009 | 2.41 | 105 |
| 2008 | 1.14 | 123 |
| 2007 | 1.81 | 108 |
| 2006 | 1.35 | 113 |
| 2005 | 1.27 | 106 |
| 2004 | 2.2 | 86 |
| 2003 | 1.94 | 87 |
| 2002 | 1.82 | 100 |
| 2001 | 1.08 | 110 |
| 2000 | 1.83 | 83 |
| 1999 | 1.55 | 92 |
| 1998 | -.68 | 101 |
| 1997 | 1.01 | 92 |
| 1996 | 2.34 | 72 |
| 1995 | -.03 | 87 |
| 1994 | 0.32 | 79 |
| 1993 | 3.51 | 48 |
| 1992 | 3.25 | 43 |
| 1991 | 3.49 | 48 |
| 1990 | 3.2 | 43 |
| 1989 | 1.35 | 66 |
| 1988 | 3.45 | 43 |
| 1987 | 2.73 | 48 |
| 1986 | 2.58 | 50 |