| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 16.56 | 16 |
| 2015 | 16.087 | 25 |
| 2014 | 16.514 | 23 |
| 2013 | 17.313 | 19 |
| 2012 | 19.723 | 12 |
| 2011 | 15.047 | 32 |
| 2010 | 14.372 | 38 |
| 2009 | 14.805 | 45 |
| 2008 | 14.017 | 52 |
| 2007 | 13.34 | 59 |
| 2006 | 13.636 | 60 |
| 2005 | 12.883 | 64 |
| 2004 | 12.532 | 67 |
| 2003 | 16.573 | 48 |
| 2002 | 18.453 | 39 |
| 2001 | 19.666 | 47 |
| 2000 | 22.339 | 34 |
| 1999 | 22.38 | 38 |
| 1998 | 29.49 | 29 |
| 1997 | 30.245 | 26 |
| 1996 | 33.787 | 26 |
| 1995 | 28.796 | 31 |
| 1994 | 36.24 | 20 |
| 1993 | 29.989 | 27 |
| 1992 | 21.068 | 31 |
| 1991 | 18.998 | 36 |
| 1990 | 18.75 | 32 |
| 1989 | 17.25 | 34 |
| 1988 | 15 | 37 |
| 1987 | 14 | 38 |
| 1986 | 14 | 44 |