| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.62 | 90 |
| 2015 | 6.67 | 86 |
| 2014 | 6.78 | 89 |
| 2013 | 6.76 | 84 |
| 2012 | 6.74 | 83 |
| 2011 | 6.73 | 78 |
| 2010 | 6.72 | 72 |
| 2009 | 6.71 | 76 |
| 2008 | 6.7 | 92 |
| 2007 | 6.69 | 87 |
| 2006 | 6.69 | 79 |
| 2005 | 6.69 | 70 |
| 2004 | 6.68 | 69 |
| 2003 | 6.69 | 71 |
| 2002 | 6.68 | 73 |
| 2001 | 6.67 | 71 |
| 2000 | 6.67 | 74 |
| 1999 | 6.67 | 71 |
| 1998 | 6.66 | 71 |
| 1997 | 6.59 | 70 |
| 1996 | 6.68 | 70 |
| 1995 | 6.64 | 71 |
| 1994 | 6.37 | 70 |
| 1993 | 6.64 | 79 |
| 1992 | 6.49 | 74 |
| 1991 | 6.64 | 79 |