| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2010 | 3.625 | 83 |
| 2009 | 2.5 | 121 |
| 2008 | 2.396 | 142 |
| 2007 | 2.25 | 153 |
| 2006 | 2.25 | 145 |
| 2005 | 2.25 | 128 |
| 2004 | 2.646 | 110 |
| 2003 | 3 | 110 |
| 2002 | 3.625 | 105 |
| 2001 | 4.75 | 100 |
| 2000 | 5.958 | 88 |
| 1999 | 7.313 | 80 |
| 1998 | 8.917 | 67 |
| 1997 | 9.792 | 63 |
| 1996 | 9.625 | 69 |
| 1994 | 8.75 | 61 |
| 1990 | 11.917 | 43 |
| 1989 | 12.5 | 38 |
| 1988 | 12.5 | 31 |
| 1987 | 12.5 | 28 |
| 1986 | 12.5 | 25 |