| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11 | 1 |
| 2015 | 4.8 | 43 |
| 2014 | 0.7 | 163 |
| 2013 | 6.57 | 30 |
| 2012 | 13.94 | 3 |
| 2011 | 7.55 | 32 |
| 2010 | 6.4 | 60 |
| 2009 | 3.38 | 48 |
| 2008 | 8.23 | 25 |
| 2007 | 1.38 | 183 |
| 2006 | 10.16 | 21 |
| 2005 | 4.4 | 107 |
| 2004 | 54.16 | 1 |
| 2003 | -33.1 | 203 |
| 2002 | -6.9 | 192 |
| 2001 | 2.31 | 118 |
| 2000 | 1.41 | 162 |
| 1999 | 17.58 | 3 |
| 1998 | 34.86 | 1 |
| 1997 | 21.24 | 4 |
| 1996 | 11.02 | 12 |
| 1995 | 2.12 | 137 |
| 1994 | 3.85 | 90 |
| 1993 | 30.29 | 2 |
| 1992 | 32.59 | 2 |
| 1991 | -64.05 | 176 |
| 1990 | 57.82 | 1 |
| 1989 | -3.12 | 152 |
| 1988 | -.02 | 137 |
| 1987 | 9.31 | 21 |
| 1986 | 4.65 | 63 |