| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2007 | 578.958 | 1 |
| 2006 | 496.458 | 1 |
| 2005 | 235.675 | 1 |
| 2004 | 278.917 | 1 |
| 2003 | 97.292 | 1 |
| 2002 | 36.479 | 11 |
| 2001 | 38.021 | 8 |
| 2000 | 68.208 | 2 |
| 1999 | 55.386 | 5 |
| 1998 | 42.056 | 16 |
| 1997 | 32.547 | 21 |
| 1996 | 34.234 | 24 |
| 1995 | 34.732 | 24 |
| 1994 | 34.861 | 22 |
| 1993 | 36.331 | 19 |
| 1992 | 19.771 | 36 |
| 1991 | 15.5 | 52 |
| 1990 | 11.708 | 71 |
| 1989 | 13 | 59 |
| 1988 | 13 | 49 |
| 1987 | 13 | 45 |
| 1986 | 13 | 49 |