| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2007 | 15 | 46 |
| 2006 | 15.333 | 46 |
| 2005 | 17.667 | 29 |
| 2004 | 18 | 36 |
| 2003 | 18 | 36 |
| 2002 | 18 | 42 |
| 2001 | 20.667 | 41 |
| 2000 | 22 | 39 |
| 1999 | 22 | 39 |
| 1998 | 22 | 43 |
| 1997 | 22 | 41 |
| 1996 | 22 | 50 |
| 1995 | 16 | 70 |
| 1994 | 17.5 | 51 |
| 1993 | 17.458 | 50 |
| 1992 | 17.771 | 45 |
| 1991 | 18.146 | 39 |
| 1990 | 12 | 67 |
| 1989 | 11.5 | 70 |
| 1988 | 10.792 | 66 |
| 1987 | 10.5 | 69 |
| 1986 | 11 | 66 |