| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.463 | 54 |
| 2015 | 3.802 | 59 |
| 2014 | 3.893 | 66 |
| 2013 | 3.914 | 66 |
| 2012 | 3.834 | 75 |
| 2011 | 3.757 | 80 |
| 2010 | 3.694 | 80 |
| 2009 | 3.809 | 90 |
| 2008 | 3.914 | 107 |
| 2007 | 3.669 | 120 |
| 2006 | 3.667 | 107 |
| 2005 | 3.523 | 96 |
| 2004 | 3.605 | 91 |
| 2003 | 3.779 | 94 |
| 2002 | 4.544 | 88 |
| 2001 | 5.038 | 85 |
| 2000 | 5.158 | 94 |
| 1999 | 6.388 | 86 |
| 1998 | 7.261 | 85 |
| 1991 | 8.5 | 60 |
| 1990 | 8.5 | 61 |
| 1989 | 8.5 | 61 |
| 1988 | 8.5 | 54 |
| 1987 | 8.5 | 49 |
| 1986 | 8.5 | 53 |