| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.48 | 124 |
| 2015 | 9.78 | 128 |
| 2014 | 10.36 | 129 |
| 2013 | 10.36 | 130 |
| 2012 | 10.39 | 127 |
| 2011 | 10.36 | 126 |
| 2010 | 9.25 | 122 |
| 2009 | 10.15 | 133 |
| 2008 | 9.47 | 135 |
| 2007 | 8.8 | 126 |
| 2006 | 10.03 | 132 |
| 2005 | 8.47 | 110 |
| 2004 | 8.39 | 99 |
| 2003 | 8.05 | 92 |
| 2002 | 5.65 | 58 |
| 2001 | 9.13 | 109 |
| 2000 | 9.88 | 115 |
| 1999 | 8.34 | 99 |
| 1998 | 8.58 | 100 |
| 1997 | 10.01 | 116 |
| 1996 | 10.26 | 117 |
| 1995 | 8.91 | 109 |
| 1994 | 8.53 | 102 |
| 1993 | 8.17 | 97 |
| 1992 | 7.94 | 98 |
| 1991 | 10.47 | 125 |