| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.59 | 127 |
| 2015 | 2.25 | 120 |
| 2014 | 1.91 | 134 |
| 2013 | 4.05 | 82 |
| 2012 | 5.32 | 51 |
| 2011 | 6.11 | 56 |
| 2010 | 5.84 | 70 |
| 2009 | -1.56 | 122 |
| 2008 | 3.53 | 105 |
| 2007 | 4.91 | 119 |
| 2006 | 6.32 | 80 |
| 2005 | 5.74 | 81 |
| 2004 | 7.21 | 50 |
| 2003 | 4.09 | 101 |
| 2002 | 3.11 | 103 |
| 2001 | 3.3 | 95 |
| 2000 | 5.33 | 71 |
| 1999 | -.41 | 161 |
| 1998 | 4.32 | 78 |
| 1997 | 7.43 | 34 |
| 1996 | 6.8 | 44 |
| 1995 | 8.93 | 17 |
| 1994 | 5.03 | 63 |
| 1993 | 6.59 | 32 |
| 1992 | 11.17 | 11 |
| 1991 | 7.8 | 22 |
| 1990 | 3.33 | 85 |
| 1989 | 9.92 | 13 |
| 1988 | 7.35 | 43 |
| 1987 | 6.46 | 40 |
| 1986 | 5.38 | 50 |