| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.588 | 6 |
| 2015 | 11.105 | 2 |
| 2014 | 12.866 | 2 |
| 2013 | 9.05 | 10 |
| 2012 | 9.909 | 18 |
| 2011 | 13.002 | 5 |
| 2010 | 16.737 | 4 |
| 2009 | 14.682 | 4 |
| 2008 | 16.4 | 5 |
| 2007 | 15.757 | 12 |
| 2006 | 12.845 | 14 |
| 2005 | 12.317 | 11 |
| 2004 | 5.079 | 86 |
| 2003 | 8.468 | 20 |
| 2002 | 5.637 | 50 |
| 2001 | 4.54 | 69 |
| 2000 | 10.884 | 11 |
| 1999 | 8.113 | 17 |
| 1998 | 6.484 | 28 |
| 1997 | 4.397 | 79 |
| 1996 | 6.993 | 29 |
| 1995 | 10.586 | 9 |
| 1994 | 9.631 | 14 |
| 1993 | 21.876 | 3 |
| 1992 | -16.72 | 127 |
| 1991 | -19.46 | 124 |
| 1990 | 2.748 | 67 |
| 1989 | -.569 | 92 |
| 1988 | 4.575 | 48 |
| 1987 | 10.681 | 13 |
| 1986 | 0.912 | 85 |