| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.134 | 46 |
| 2015 | 6.897 | 37 |
| 2014 | 8.924 | 21 |
| 2013 | 9.38 | 21 |
| 2012 | 12.89 | 9 |
| 2011 | 12.358 | 10 |
| 2010 | 11.115 | 15 |
| 2009 | 11.921 | 15 |
| 2008 | 12.75 | 8 |
| 2007 | 12.75 | 9 |
| 2006 | 10.75 | 14 |
| 2005 | 12.144 | 11 |
| 2004 | 11.49 | 19 |
| 2003 | 9.49 | 36 |
| 2002 | 15 | 18 |
| 2001 | 15 | 19 |
| 2000 | 21 | 10 |
| 1999 | 27 | 9 |
| 1998 | 38.292 | 6 |
| 1997 | 36.75 | 4 |
| 1996 | 31 | 15 |
| 1995 | 35 | 16 |
| 1994 | 35 | 14 |
| 1993 | 35 | 12 |
| 1992 | 35 | 15 |
| 1991 | 35 | 13 |
| 1990 | 16 | 32 |
| 1989 | 16 | 27 |