| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.506 | 95 |
| 2015 | 1.759 | 102 |
| 2014 | 2.548 | 95 |
| 2013 | 2.943 | 91 |
| 2012 | 4.388 | 68 |
| 2011 | 4.084 | 74 |
| 2010 | 3.954 | 75 |
| 2009 | 4.433 | 82 |
| 2008 | 5.078 | 81 |
| 2007 | 3.439 | 129 |
| 2006 | 3.356 | 113 |
| 2005 | 3.807 | 88 |
| 2004 | 3.75 | 88 |
| 2003 | 3.573 | 97 |
| 2002 | 4.583 | 87 |
| 2001 | 5.678 | 78 |
| 2000 | 6.5 | 82 |
| 1999 | 6.5 | 85 |
| 1998 | 6.5 | 94 |
| 1997 | 6.583 | 89 |
| 1996 | 7 | 87 |
| 1995 | 5.75 | 97 |
| 1994 | 5.75 | 90 |
| 1993 | 5.75 | 89 |
| 1992 | 5.75 | 91 |
| 1991 | 5.75 | 93 |
| 1990 | 5.75 | 96 |
| 1989 | 5.75 | 87 |
| 1988 | 5.75 | 82 |
| 1987 | 5.75 | 79 |
| 1986 | 5.75 | 85 |