| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.783 | 10 |
| 2015 | 8.992 | 20 |
| 2014 | 7.877 | 27 |
| 2013 | 6.491 | 46 |
| 2012 | 7 | 46 |
| 2011 | 7.023 | 42 |
| 2010 | 7.4 | 40 |
| 2009 | 7.09 | 54 |
| 2008 | 6.551 | 65 |
| 2007 | 9.216 | 24 |
| 2006 | 10.325 | 17 |
| 2005 | 11.189 | 15 |
| 2004 | 11.51 | 18 |
| 2003 | 21.95 | 8 |
| 2002 | 23.325 | 8 |
| 2001 | 23.408 | 7 |
| 2000 | 20.242 | 11 |
| 1999 | 20.267 | 20 |
| 1998 | 13.083 | 40 |
| 1997 | 34.475 | 7 |
| 1996 | 42.125 | 7 |
| 1995 | 30.242 | 18 |
| 1994 | 46.142 | 11 |
| 1992 | 48.5 | 9 |
| 1990 | 25.654 | 17 |
| 1989 | 11.44 | 43 |
| 1988 | 11.44 | 36 |
| 1987 | 13.234 | 25 |
| 1986 | 17.742 | 13 |