| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11.96 | 117 |
| 2015 | 11.7 | 117 |
| 2014 | 11.43 | 118 |
| 2013 | 11.19 | 118 |
| 2012 | 10.97 | 117 |
| 2011 | 10.75 | 116 |
| 2010 | 10.55 | 116 |
| 2009 | 10.33 | 115 |
| 2008 | 10.13 | 112 |
| 2007 | 9.94 | 112 |
| 2006 | 9.75 | 110 |
| 2005 | 9.58 | 108 |
| 2004 | 9.41 | 107 |
| 2003 | 9.25 | 106 |
| 2002 | 9.1 | 107 |
| 2001 | 8.96 | 105 |
| 2000 | 8.83 | 106 |
| 1999 | 8.71 | 105 |
| 1998 | 8.6 | 107 |
| 1997 | 8.5 | 106 |
| 1996 | 8.41 | 107 |
| 1995 | 8.33 | 106 |
| 1994 | 8.25 | 109 |
| 1993 | 8.18 | 109 |
| 1992 | 8.12 | 112 |
| 1991 | 8.06 | 113 |
| 1990 | 8.01 | 114 |
| 1989 | 7.96 | 113 |
| 1988 | 7.91 | 113 |
| 1987 | 7.87 | 111 |
| 1986 | 7.83 | 109 |