| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2006 | 9.806 | 93 |
| 2005 | 9.619 | 95 |
| 2004 | 9.95 | 94 |
| 2003 | 13.64 | 70 |
| 2002 | 15.813 | 58 |
| 2001 | 16.232 | 62 |
| 2000 | 17.118 | 59 |
| 1999 | 17.42 | 62 |
| 1998 | 49.548 | 10 |
| 1997 | 43.024 | 15 |
| 1996 | 54.503 | 13 |
| 1995 | 55.674 | 10 |
| 1994 | 43.994 | 15 |
| 1993 | 47.825 | 15 |
| 1992 | 60.174 | 7 |
| 1991 | 46.667 | 8 |
| 1990 | 37.5 | 10 |
| 1989 | 30.083 | 11 |
| 1988 | 23 | 15 |
| 1987 | 18.417 | 20 |
| 1986 | 18 | 19 |