| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.334 | 68 |
| 2015 | 8.669 | 76 |
| 2014 | 8.937 | 80 |
| 2013 | 9.074 | 83 |
| 2012 | 9.043 | 86 |
| 2011 | 8.84 | 90 |
| 2010 | 9.455 | 87 |
| 2009 | 10.019 | 90 |
| 2008 | 9.064 | 97 |
| 2007 | 9.168 | 101 |
| 2006 | 9.502 | 96 |
| 2005 | 9.918 | 92 |
| 2004 | 8.941 | 100 |
| 2003 | 11.501 | 85 |
| 2002 | 10.973 | 94 |
| 2001 | 11.14 | 94 |
| 2000 | 11.681 | 94 |
| 1999 | 11.396 | 102 |
| 1998 | 11.273 | 105 |
| 1997 | 11.173 | 100 |
| 1996 | 11.43 | 98 |
| 1995 | 11.501 | 94 |
| 1994 | 11.61 | 81 |
| 1993 | 11.924 | 78 |
| 1992 | 11.523 | 81 |
| 1991 | 11.216 | 78 |
| 1990 | 10.5 | 80 |
| 1989 | 10.5 | 77 |
| 1988 | 10.5 | 69 |
| 1987 | 10.5 | 68 |
| 1986 | 10.25 | 71 |