| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.86 | 24 |
| 2015 | 4 | 60 |
| 2014 | 4.19 | 72 |
| 2013 | 2.81 | 106 |
| 2012 | 6.45 | 36 |
| 2011 | 6.52 | 45 |
| 2010 | 8.45 | 23 |
| 2009 | 2.96 | 61 |
| 2008 | 7.29 | 36 |
| 2007 | 5.66 | 105 |
| 2006 | 6.25 | 81 |
| 2005 | 8.66 | 33 |
| 2004 | 4.48 | 117 |
| 2003 | 7.8 | 33 |
| 2002 | 4.35 | 69 |
| 2001 | 6.61 | 24 |
| 2000 | 1.82 | 155 |
| 1999 | 7.4 | 27 |
| 1998 | 7.31 | 26 |
| 1997 | 6.32 | 49 |
| 1996 | 11.01 | 13 |
| 1995 | 5.72 | 61 |
| 1994 | 1.32 | 137 |
| 1993 | 3.46 | 79 |
| 1992 | 0.23 | 124 |
| 1991 | 9.07 | 14 |
| 1990 | -.6 | 132 |
| 1989 | 2.15 | 112 |
| 1988 | 5.8 | 60 |
| 1987 | -.24 | 135 |
| 1986 | 7.96 | 24 |