| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 15.97 | 42 |
| 2015 | 15.56 | 48 |
| 2014 | 15.82 | 52 |
| 2013 | 16.2 | 53 |
| 2012 | 14.39 | 55 |
| 2011 | 15 | 53 |
| 2010 | 13.91 | 57 |
| 2009 | 15.24 | 53 |
| 2008 | 14.09 | 55 |
| 2007 | 12.7 | 63 |
| 2006 | 12.53 | 68 |
| 2005 | 13.33 | 66 |
| 2004 | 12.77 | 75 |
| 2003 | 12.38 | 76 |
| 2002 | 12.07 | 79 |
| 2001 | 12.61 | 76 |
| 2000 | 13.32 | 73 |
| 1999 | 18.72 | 59 |
| 1998 | 18.85 | 58 |
| 1997 | 19.39 | 57 |
| 1996 | 19.91 | 58 |
| 1995 | 18.88 | 62 |
| 1994 | 21.73 | 53 |
| 1993 | 21.48 | 52 |
| 1992 | 22.4 | 50 |
| 1991 | 23.79 | 48 |
| 1990 | 25.01 | 46 |
| 1989 | 23.98 | 43 |
| 1988 | 28.45 | 35 |
| 1987 | 29.78 | 30 |
| 1986 | 30.24 | 30 |