| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.247 | 23 |
| 2015 | 5.801 | 32 |
| 2014 | 5.624 | 46 |
| 2013 | 5.514 | 55 |
| 2012 | 6.576 | 45 |
| 2011 | 6.217 | 51 |
| 2010 | 5.529 | 71 |
| 2009 | 5.08 | 42 |
| 2008 | 5.762 | 59 |
| 2007 | 6.485 | 89 |
| 2006 | 6.602 | 76 |
| 2005 | 6.196 | 69 |
| 2004 | 5.213 | 82 |
| 2003 | 4.979 | 68 |
| 2002 | 4.837 | 65 |
| 2001 | 5.372 | 48 |
| 2000 | 5.284 | 61 |
| 1999 | 4.449 | 63 |
| 1998 | 4.54 | 60 |
| 1997 | 4.086 | 87 |
| 1996 | 3.807 | 73 |
| 1995 | 4.594 | 52 |
| 1994 | 4.051 | 56 |
| 1993 | 3.877 | 51 |
| 1992 | 4.201 | 55 |
| 1991 | 3.388 | 51 |
| 1990 | 3.151 | 65 |
| 1989 | 3.304 | 63 |
| 1988 | 3.083 | 63 |
| 1987 | 3.766 | 59 |
| 1986 | 4.024 | 48 |