| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 10.76 | 115 |
| 2014 | 11.45 | 123 |
| 2013 | 11.68 | 137 |
| 2012 | 11.73 | 136 |
| 2011 | 11.87 | 138 |
| 2010 | 10.47 | 143 |
| 2009 | 11.42 | 135 |
| 2008 | 12.51 | 132 |
| 2007 | 12.66 | 133 |
| 2006 | 12.08 | 132 |
| 2005 | 12.96 | 118 |
| 2004 | 13.87 | 104 |
| 2003 | 11.69 | 116 |
| 2002 | 10.21 | 126 |
| 2001 | 9.23 | 132 |
| 2000 | 9.45 | 130 |
| 1999 | 8.61 | 128 |
| 1998 | 8.68 | 125 |
| 1997 | 9.65 | 110 |
| 1996 | 10.91 | 97 |
| 1995 | 11.49 | 93 |
| 1994 | 12.55 | 81 |
| 1993 | 11.83 | 92 |
| 1992 | 10.79 | 88 |
| 1991 | 9.09 | 91 |
| 1990 | 9.23 | 89 |
| 1989 | 10.13 | 79 |
| 1988 | 8.08 | 90 |
| 1987 | 10.36 | 77 |
| 1986 | 13.76 | 57 |