| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 5.518 | 36 |
| 2014 | 7.787 | 17 |
| 2013 | 6.905 | 35 |
| 2012 | 3.858 | 92 |
| 2011 | 7.371 | 34 |
| 2010 | 4.256 | 93 |
| 2009 | 6.328 | 27 |
| 2008 | 5.217 | 65 |
| 2007 | 8.242 | 61 |
| 2006 | 5.152 | 100 |
| 2005 | 2.447 | 134 |
| 2004 | 9.949 | 27 |
| 2003 | 7.636 | 28 |
| 2002 | -.085 | 148 |
| 2001 | 4.387 | 72 |
| 2000 | 3.444 | 109 |
| 1999 | 3.556 | 85 |
| 1998 | 1.348 | 125 |
| 1997 | 4.167 | 83 |
| 1996 | 6.204 | 37 |
| 1995 | 4.52 | 53 |
| 1994 | -5.263 | 122 |
| 1993 | 1.615 | 86 |
| 1992 | 4.908 | 46 |
| 1991 | 11.517 | 3 |
| 1990 | -.507 | 88 |
| 1989 | 2.461 | 70 |
| 1988 | 0.856 | 91 |
| 1987 | 4.22 | 52 |
| 1986 | 3.953 | 49 |