| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 12.95 | 51 |
| 2015 | 14.48 | 54 |
| 2014 | 13 | 59 |
| 2013 | 14.69 | 58 |
| 2012 | 13.37 | 59 |
| 2011 | 14.25 | 57 |
| 2010 | 14.44 | 54 |
| 2009 | 14.68 | 54 |
| 2008 | 13.3 | 58 |
| 2007 | 12.2 | 65 |
| 2006 | 15.09 | 57 |
| 2005 | 13.09 | 68 |
| 2004 | 14.56 | 62 |
| 2003 | 15.46 | 60 |
| 2002 | 14.78 | 67 |
| 2001 | 14.77 | 67 |
| 2000 | 13.29 | 74 |
| 1999 | 15.55 | 68 |
| 1998 | 18.08 | 62 |
| 1997 | 16.52 | 70 |
| 1996 | 20.69 | 54 |
| 1995 | 15.36 | 73 |
| 1994 | 19.63 | 59 |
| 1993 | 15.08 | 71 |
| 1992 | 16.19 | 67 |
| 1991 | 19.95 | 57 |
| 1990 | 17.22 | 67 |
| 1989 | 16.48 | 62 |
| 1988 | 16.33 | 63 |
| 1987 | 13.48 | 70 |
| 1986 | 17.67 | 57 |