| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2005 | 12.47 | 126 |
| 2004 | 14.04 | 103 |
| 2003 | 15.4 | 89 |
| 2002 | 15.63 | 89 |
| 2001 | 17.43 | 75 |
| 2000 | 20.3 | 57 |
| 1999 | 24.51 | 41 |
| 1998 | 26.96 | 36 |
| 1997 | 22.22 | 46 |
| 1996 | 20.18 | 56 |
| 1995 | 21.31 | 50 |
| 1994 | 24.97 | 37 |
| 1993 | 30.46 | 29 |
| 1992 | 22.75 | 37 |
| 1991 | 22.31 | 34 |
| 1990 | 20.97 | 39 |
| 1989 | 28.42 | 28 |
| 1988 | 26.7 | 30 |
| 1987 | 26.42 | 31 |
| 1986 | 29.56 | 24 |