| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 7.439 | 14 |
| 2015 | 4.099 | 64 |
| 2014 | 8.902 | 10 |
| 2013 | 4.755 | 70 |
| 2012 | 7.469 | 34 |
| 2011 | 5.818 | 60 |
| 2010 | 6.214 | 60 |
| 2009 | 0.558 | 99 |
| 2008 | -5.138 | 169 |
| 2007 | 10.711 | 35 |
| 2006 | 10.158 | 29 |
| 2005 | 4.86 | 91 |
| 2004 | -.575 | 160 |
| 2003 | 9.739 | 16 |
| 2002 | 10.807 | 10 |
| 2001 | 5.2 | 51 |
| 2000 | 6.566 | 38 |
| 1999 | 9.67 | 12 |
| 1998 | 6.36 | 30 |
| 1997 | 25.55 | 2 |
| 1996 | 5.042 | 58 |
| 1995 | -3.285 | 119 |
| 1994 | 12.722 | 8 |
| 1993 | -2.608 | 116 |
| 1992 | -1.328 | 108 |
| 1991 | -.765 | 98 |
| 1990 | -1.793 | 95 |
| 1989 | 3.943 | 55 |
| 1988 | -.037 | 96 |
| 1987 | 22.875 | 3 |
| 1986 | 23.437 | 2 |