| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.42 | 102 |
| 2015 | 5.575 | 104 |
| 2014 | 5.95 | 108 |
| 2013 | 6.179 | 109 |
| 2012 | 6.975 | 106 |
| 2011 | 7.738 | 99 |
| 2010 | 7.279 | 109 |
| 2009 | 6.021 | 121 |
| 2008 | 8.908 | 100 |
| 2007 | 8.196 | 114 |
| 2006 | 7.613 | 123 |
| 2005 | 7.258 | 118 |
| 2004 | 7.05 | 122 |
| 2003 | 6.613 | 123 |
| 2002 | 6.363 | 135 |
| 2001 | 6.842 | 135 |
| 2000 | 7.717 | 128 |
| 1999 | 6.567 | 134 |
| 1998 | 6.683 | 132 |
| 1997 | 7.167 | 125 |
| 1996 | 9.729 | 113 |
| 1995 | 10.5 | 105 |
| 1994 | 9.088 | 102 |
| 1993 | 9.417 | 100 |
| 1992 | 10.583 | 86 |
| 1991 | 13.417 | 62 |
| 1990 | 16.354 | 40 |
| 1989 | 16.458 | 37 |
| 1988 | 14.083 | 41 |
| 1987 | 15.083 | 30 |
| 1986 | 15 | 30 |