| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11 | 132 |
| 2015 | 10.56 | 158 |
| 2014 | 10.72 | 164 |
| 2013 | 11.27 | 168 |
| 2012 | 12.84 | 164 |
| 2011 | 14.31 | 161 |
| 2010 | 16.71 | 146 |
| 2009 | 18.15 | 139 |
| 2008 | 20.72 | 133 |
| 2007 | 21.08 | 129 |
| 2006 | 20.47 | 131 |
| 2005 | 20.48 | 129 |
| 2004 | 20.54 | 132 |
| 2003 | 20.3 | 137 |
| 2002 | 19.9 | 132 |
| 2001 | 19.2 | 135 |
| 2000 | 19.41 | 135 |
| 1999 | 19.96 | 130 |
| 1998 | 20.71 | 128 |
| 1997 | 21.31 | 124 |
| 1996 | 21.96 | 117 |
| 1995 | 21.98 | 118 |
| 1994 | 23.23 | 97 |
| 1993 | 24.68 | 91 |
| 1992 | 25.56 | 84 |
| 1991 | 26.74 | 80 |
| 1990 | 25.93 | 82 |
| 1989 | 26.58 | 69 |
| 1988 | 27.5 | 63 |
| 1987 | 27.5 | 61 |
| 1986 | 27.59 | 55 |