| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.09 | 53 |
| 2015 | 2.96 | 93 |
| 2014 | 4.72 | 56 |
| 2013 | 14.04 | 2 |
| 2012 | -1.24 | 177 |
| 2011 | 4.34 | 87 |
| 2010 | 13.09 | 6 |
| 2009 | -3.97 | 152 |
| 2008 | 6.36 | 53 |
| 2007 | 5.42 | 109 |
| 2006 | 4.81 | 120 |
| 2005 | 2.13 | 170 |
| 2004 | 4.06 | 132 |
| 2003 | 4.32 | 91 |
| 2002 | -.02 | 172 |
| 2001 | -.83 | 173 |
| 2000 | -2.31 | 191 |
| 1999 | -1.37 | 172 |
| 1998 | 0.07 | 166 |
| 1997 | 4.24 | 101 |
| 1996 | 1.57 | 155 |
| 1995 | 6.82 | 40 |
| 1994 | 5.32 | 56 |
| 1993 | 4.94 | 54 |
| 1992 | 1.7 | 94 |
| 1991 | 3.49 | 66 |
| 1990 | 4.12 | 68 |
| 1989 | 6.94 | 30 |
| 1988 | 5.92 | 56 |
| 1987 | 7.58 | 30 |
| 1986 | 4.96 | 54 |