| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.74 | 97 |
| 2015 | 9.56 | 98 |
| 2014 | 9.52 | 100 |
| 2013 | 9.59 | 102 |
| 2012 | 9.74 | 105 |
| 2011 | 9.88 | 109 |
| 2010 | 9.99 | 112 |
| 2009 | 10.14 | 113 |
| 2008 | 10.24 | 114 |
| 2007 | 10.3 | 115 |
| 2006 | 10.33 | 117 |
| 2005 | 10.37 | 120 |
| 2004 | 10.18 | 118 |
| 2003 | 10.08 | 118 |
| 2002 | 10.08 | 121 |
| 2001 | 10.17 | 120 |
| 2000 | 10.3 | 123 |
| 1999 | 10.71 | 129 |
| 1998 | 11.16 | 132 |
| 1997 | 11.64 | 134 |
| 1996 | 12.13 | 136 |
| 1995 | 12.58 | 136 |
| 1994 | 12.66 | 137 |
| 1993 | 12.6 | 139 |
| 1992 | 12.45 | 139 |
| 1991 | 12.27 | 140 |
| 1990 | 12.19 | 140 |
| 1989 | 11.38 | 137 |
| 1988 | 10.77 | 135 |
| 1987 | 10.31 | 134 |
| 1986 | 9.91 | 132 |