| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.041 | 121 |
| 2015 | 4.436 | 128 |
| 2014 | 4.964 | 131 |
| 2013 | 5.113 | 134 |
| 2012 | 5.381 | 125 |
| 2011 | 5.487 | 125 |
| 2010 | 7.271 | 110 |
| 2009 | 7.044 | 116 |
| 2008 | 6.844 | 125 |
| 2007 | 7.428 | 128 |
| 2006 | 7.18 | 131 |
| 2005 | 6.652 | 129 |
| 2004 | 6.99 | 124 |
| 1994 | 8.863 | 106 |
| 1993 | 7.2 | 113 |
| 1992 | 8.125 | 100 |
| 1991 | 9.5 | 88 |
| 1990 | 9.5 | 89 |
| 1989 | 9.5 | 89 |
| 1988 | 9.5 | 78 |
| 1987 | 9.5 | 79 |
| 1986 | 9.5 | 78 |