| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 11.31 | 111 |
| 2014 | 11.71 | 122 |
| 2013 | 12.27 | 131 |
| 2012 | 12.34 | 134 |
| 2011 | 11.86 | 139 |
| 2010 | 11.83 | 135 |
| 2009 | 11.02 | 139 |
| 2008 | 13.62 | 120 |
| 2007 | 13.05 | 130 |
| 2006 | 13.9 | 117 |
| 2005 | 12.28 | 130 |
| 2004 | 10.51 | 129 |
| 2003 | 8.14 | 138 |
| 2002 | 7.97 | 142 |
| 2001 | 7.82 | 137 |
| 2000 | 7.76 | 132 |
| 1999 | 7.02 | 133 |
| 1998 | 6.31 | 131 |
| 1997 | 5.25 | 135 |
| 1996 | 4.75 | 137 |
| 1995 | 4.79 | 136 |
| 1994 | 4.41 | 131 |
| 1993 | 4.21 | 129 |
| 1992 | 4.1 | 123 |
| 1991 | 4.08 | 120 |
| 1990 | 3.38 | 122 |
| 1989 | 3.43 | 118 |
| 1988 | 3.11 | 117 |
| 1987 | 2.9 | 117 |
| 1986 | 2.92 | 115 |