| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.771 | 44 |
| 2015 | 4.375 | 53 |
| 2014 | 4.028 | 61 |
| 2013 | 3.89 | 67 |
| 2012 | 3.89 | 74 |
| 2011 | 3.844 | 79 |
| 2010 | 3.903 | 76 |
| 2009 | 4.78 | 80 |
| 2008 | 4.865 | 83 |
| 2007 | 5.26 | 78 |
| 2006 | 4.22 | 97 |
| 2005 | 3.585 | 94 |
| 2004 | 4.157 | 78 |
| 2003 | 5.668 | 59 |
| 2002 | 5.606 | 66 |
| 2001 | 6.785 | 63 |
| 2000 | 8.803 | 55 |
| 1999 | 10.508 | 49 |
| 1998 | 39.392 | 4 |
| 1997 | 28.088 | 11 |
| 1996 | 41.495 | 8 |
| 1995 | 43.312 | 11 |
| 1994 | 33.645 | 15 |
| 1993 | 31.968 | 15 |
| 1992 | 46.807 | 10 |
| 1991 | 41.539 | 10 |
| 1990 | 43.549 | 8 |
| 1989 | 40.241 | 9 |
| 1988 | 33.996 | 9 |
| 1987 | 25.335 | 9 |
| 1986 | 21.393 | 10 |