| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11.576 | 43 |
| 2015 | 10.591 | 56 |
| 2014 | 10.339 | 64 |
| 2013 | 9.92 | 70 |
| 2012 | 10.119 | 72 |
| 2011 | 10.429 | 71 |
| 2010 | 11.223 | 59 |
| 2009 | 13 | 58 |
| 2008 | 16.187 | 37 |
| 2007 | 14.132 | 50 |
| 2006 | 12.161 | 66 |
| 2005 | 11.717 | 70 |
| 2004 | 12.375 | 69 |
| 2003 | 16.015 | 50 |
| 2002 | 17.11 | 50 |
| 2001 | 16.554 | 61 |
| 2000 | 17.112 | 60 |
| 1999 | 19.063 | 57 |
| 1998 | 20.063 | 56 |
| 1997 | 18.033 | 61 |
| 1996 | 17.708 | 67 |
| 1995 | 16.375 | 62 |
| 1994 | 14.25 | 74 |
| 1993 | 15.833 | 60 |
| 1992 | 18.25 | 42 |
| 1991 | 20 | 34 |
| 1990 | 20.417 | 29 |
| 1989 | 18.75 | 29 |
| 1988 | 13.667 | 42 |
| 1987 | 11.125 | 65 |
| 1986 | 13.417 | 46 |