| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.84 | 65 |
| 2015 | 9.74 | 64 |
| 2014 | 9.65 | 64 |
| 2013 | 9.57 | 63 |
| 2012 | 9.49 | 62 |
| 2011 | 9.41 | 62 |
| 2010 | 9.32 | 60 |
| 2009 | 8.8 | 62 |
| 2008 | 8.28 | 63 |
| 2007 | 7.76 | 68 |
| 2006 | 7.25 | 72 |
| 2005 | 6.79 | 76 |
| 2004 | 6.57 | 79 |
| 2003 | 6.38 | 81 |
| 2002 | 6.21 | 81 |
| 2001 | 6.04 | 81 |
| 2000 | 5.87 | 80 |
| 1999 | 5.72 | 81 |
| 1998 | 5.57 | 82 |
| 1997 | 5.42 | 83 |
| 1996 | 5.28 | 83 |
| 1995 | 5.15 | 84 |
| 1994 | 5.1 | 82 |
| 1993 | 5.06 | 78 |
| 1992 | 5.03 | 78 |
| 1991 | 4.99 | 77 |
| 1990 | 4.95 | 77 |
| 1989 | 4.89 | 76 |
| 1988 | 4.82 | 76 |
| 1987 | 4.74 | 76 |
| 1986 | 4.67 | 76 |