| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.14 | 62 |
| 2015 | 7.93 | 128 |
| 2014 | 8.1 | 139 |
| 2013 | 7.71 | 152 |
| 2012 | 7.82 | 154 |
| 2011 | 8.24 | 153 |
| 2010 | 8.58 | 154 |
| 2009 | 8.98 | 152 |
| 2008 | 8.85 | 148 |
| 2007 | 9.68 | 148 |
| 2006 | 8.88 | 146 |
| 2005 | 8.87 | 149 |
| 2004 | 9.15 | 137 |
| 2003 | 9.82 | 128 |
| 2002 | 9.6 | 131 |
| 2001 | 9.34 | 131 |
| 2000 | 9.46 | 129 |
| 1999 | 9.77 | 120 |
| 1998 | 8.96 | 122 |
| 1997 | 8.97 | 123 |
| 1996 | 9.63 | 110 |
| 1995 | 9.43 | 110 |
| 1994 | 9.51 | 104 |
| 1993 | 8.49 | 111 |
| 1992 | 7.9 | 110 |
| 1991 | 7.69 | 110 |
| 1990 | 7.87 | 101 |
| 1989 | 7.55 | 100 |