| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.62 | 114 |
| 2015 | 8.72 | 114 |
| 2014 | 8.96 | 115 |
| 2013 | 9.03 | 115 |
| 2012 | 9.1 | 116 |
| 2011 | 9.15 | 118 |
| 2010 | 9.2 | 120 |
| 2009 | 9.24 | 118 |
| 2008 | 9.24 | 132 |
| 2007 | 9.24 | 133 |
| 2006 | 9.24 | 125 |
| 2005 | 9.23 | 119 |
| 2004 | 9.22 | 112 |
| 2003 | 9.21 | 110 |
| 2002 | 9.21 | 108 |
| 2001 | 9.21 | 114 |
| 2000 | 9.21 | 110 |
| 1999 | 9.22 | 108 |
| 1998 | 9.24 | 106 |
| 1997 | 9.28 | 107 |
| 1996 | 9.29 | 104 |
| 1995 | 8.85 | 107 |
| 1994 | 8.75 | 106 |
| 1993 | 8.85 | 105 |
| 1992 | 8.93 | 107 |
| 1991 | 8.95 | 108 |