| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2010 | 8.36 | 110 |
| 2009 | -.63 | 149 |
| 2008 | 10.35 | 109 |
| 2007 | 11.14 | 128 |
| 2006 | 11.27 | 130 |
| 2005 | 9.49 | 122 |
| 2004 | 3.53 | 146 |
| 2003 | 9.5 | 101 |
| 2002 | 0.24 | 145 |
| 2001 | 9.08 | 108 |
| 2000 | 1.51 | 142 |
| 1999 | 7.14 | 124 |
| 1998 | 0.29 | 134 |
| 1997 | 6.63 | 126 |
| 1996 | 14.13 | 85 |
| 1995 | 9.39 | 102 |
| 1994 | 9.12 | 108 |
| 1993 | 6.18 | 102 |
| 1992 | 3.94 | 107 |
| 1991 | 1.62 | 114 |
| 1990 | 10.23 | 80 |
| 1989 | 9.41 | 91 |
| 1988 | 108.94 | 7 |
| 1987 | 17.61 | 57 |
| 1986 | 24.93 | 33 |