| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 5.719 | 34 |
| 2014 | 4.138 | 80 |
| 2013 | 5.461 | 56 |
| 2012 | 7.057 | 40 |
| 2011 | 8.008 | 23 |
| 2010 | 7.288 | 43 |
| 2009 | 7.243 | 20 |
| 2008 | 4.06 | 95 |
| 2007 | 3.201 | 140 |
| 2006 | 4.826 | 106 |
| 2005 | 2.878 | 127 |
| 2004 | 2.381 | 139 |
| 2003 | 3.295 | 105 |
| 2002 | 4.704 | 69 |
| 2001 | 1.645 | 122 |
| 2000 | 3.765 | 105 |
| 1999 | -3.684 | 148 |
| 1998 | 0.649 | 134 |
| 1997 | 7.794 | 27 |
| 1996 | 6.494 | 34 |
| 1995 | 0.594 | 105 |
| 1994 | 5.912 | 36 |
| 1993 | 3.758 | 53 |
| 1992 | 2.246 | 78 |
| 1991 | 2.768 | 61 |
| 1990 | 5.409 | 39 |
| 1989 | 4.878 | 39 |
| 1988 | 5.369 | 37 |
| 1987 | 3.504 | 64 |
| 1986 | 4.334 | 42 |