| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -7 | 175 |
| 2015 | 1.8 | 127 |
| 2014 | 6.9 | 22 |
| 2013 | 5.7 | 43 |
| 2012 | 8.88 | 14 |
| 2011 | 0.08 | 175 |
| 2010 | 13.55 | 5 |
| 2009 | 4.22 | 41 |
| 2008 | 3.05 | 122 |
| 2007 | 3.27 | 152 |
| 2006 | 0.65 | 189 |
| 2005 | 17.33 | 3 |
| 2004 | 33.63 | 4 |
| 2003 | 14.72 | 2 |
| 2002 | 8.49 | 14 |
| 2001 | 11.66 | 6 |
| 2000 | -.88 | 182 |
| 1999 | -.68 | 165 |
| 1998 | 6.95 | 32 |
| 1997 | 5.65 | 62 |
| 1996 | 2.21 | 140 |
| 1995 | 1.24 | 150 |
| 1994 | 10.14 | 10 |
| 1993 | -15.71 | 176 |
| 1992 | 8 | 26 |
| 1991 | 8.54 | 18 |
| 1990 | -4.18 | 153 |
| 1989 | 4.88 | 56 |
| 1988 | 15.48 | 3 |
| 1987 | -2.39 | 149 |
| 1986 | -4.08 | 152 |