| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2008 | 79.93 | 33 |
| 2007 | 81.62 | 30 |
| 2006 | 81.29 | 31 |
| 2005 | 73.65 | 34 |
| 2004 | 73.99 | 34 |
| 2003 | 75.08 | 30 |
| 2002 | 76.43 | 32 |
| 2001 | 80.82 | 26 |
| 2000 | 76.11 | 25 |
| 1999 | 70.66 | 29 |
| 1998 | 68.26 | 27 |
| 1997 | 64.06 | 28 |
| 1996 | 60.93 | 38 |
| 1995 | 58.54 | 37 |
| 1994 | 55.22 | 40 |
| 1993 | 50.87 | 47 |
| 1992 | 46.71 | 47 |
| 1991 | 42.28 | 55 |
| 1990 | 35.18 | 60 |
| 1989 | 27.98 | 80 |
| 1988 | 28.65 | 78 |
| 1987 | 33.88 | 57 |
| 1986 | 35.25 | 58 |