| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.815 | 129 |
| 2015 | 4.781 | 52 |
| 2014 | 6.846 | 29 |
| 2013 | 8.384 | 20 |
| 2012 | 3.969 | 91 |
| 2011 | 4.896 | 78 |
| 2010 | 12.398 | 9 |
| 2009 | 12.037 | 8 |
| 2008 | 13.212 | 12 |
| 2007 | 13.466 | 16 |
| 2006 | 13.083 | 13 |
| 2005 | 11.1 | 17 |
| 2004 | 28.503 | 4 |
| 2003 | 1.779 | 124 |
| 2002 | 13.245 | 5 |
| 2001 | 6.226 | 31 |
| 2000 | 2.694 | 119 |
| 1999 | 3.377 | 88 |
| 1998 | 4.058 | 78 |
| 1997 | 2.863 | 105 |
| 1996 | 2.024 | 115 |
| 1995 | 1.483 | 98 |
| 1994 | 1.094 | 95 |
| 1993 | 3.43 | 57 |
| 1992 | 3.51 | 65 |
| 1991 | 3.208 | 55 |
| 1990 | 9.557 | 16 |
| 1989 | 6.898 | 22 |
| 1988 | 8.077 | 19 |
| 1987 | 4.854 | 43 |
| 1986 | 2.46 | 70 |