| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.475 | 40 |
| 2015 | 5.466 | 46 |
| 2014 | 5.478 | 51 |
| 2013 | 5.452 | 52 |
| 2012 | 5.293 | 59 |
| 2011 | 5.244 | 59 |
| 2010 | 5.453 | 59 |
| 2009 | 5.577 | 69 |
| 2008 | 5.079 | 80 |
| 2007 | 4.763 | 88 |
| 2006 | 4.503 | 82 |
| 2005 | 4.349 | 78 |
| 2004 | 4.19 | 77 |
| 2003 | 4.783 | 80 |
| 2002 | 6.915 | 57 |
| 2001 | 8.754 | 46 |
| 2000 | 10.171 | 40 |
| 1999 | 7.962 | 73 |
| 1998 | 5.443 | 101 |
| 1997 | 5.828 | 96 |
| 1996 | 7.65 | 78 |
| 1995 | 7.867 | 77 |
| 1994 | 9.692 | 54 |
| 1993 | 12.633 | 41 |
| 1992 | 10.442 | 51 |
| 1991 | 24.408 | 20 |
| 1990 | 18.208 | 28 |
| 1989 | 13 | 34 |
| 1988 | 12.167 | 32 |
| 1987 | 11 | 32 |
| 1986 | 10.167 | 38 |