| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.67 | 69 |
| 2014 | 3.09 | 63 |
| 2013 | 1.94 | 83 |
| 2012 | -.2 | 122 |
| 2011 | 1.75 | 88 |
| 2010 | 1.9 | 86 |
| 2009 | -.47 | 137 |
| 2008 | 3.99 | 73 |
| 2007 | 4.79 | 69 |
| 2006 | 3.93 | 76 |
| 2005 | 7.16 | 39 |
| 2004 | 4.78 | 47 |
| 2003 | 4.69 | 48 |
| 2002 | 1.68 | 101 |
| 2001 | 4.09 | 65 |
| 2000 | 1.26 | 94 |
| 1999 | 1.78 | 86 |
| 1998 | 1.64 | 91 |
| 1997 | 3.01 | 59 |
| 1996 | 1.41 | 85 |
| 1995 | 3.66 | 42 |
| 1994 | -.12 | 84 |
| 1993 | 1.61 | 67 |
| 1992 | 1.15 | 63 |
| 1991 | -.99 | 90 |
| 1990 | 1.06 | 62 |
| 1989 | 5.29 | 34 |
| 1988 | 0 | 67 |
| 1987 | 1.31 | 59 |
| 1986 | 0.68 | 76 |