| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2010 | 59.96 | 10 |
| 2009 | 61.88 | 6 |
| 2008 | 61.48 | 12 |
| 2007 | 38.15 | 36 |
| 2006 | 36.3 | 42 |
| 2005 | 37.61 | 31 |
| 2004 | 40.11 | 23 |
| 2003 | 41.27 | 19 |
| 2002 | 42.38 | 17 |
| 2001 | 44.26 | 16 |
| 2000 | 44.39 | 17 |
| 1999 | 46.02 | 9 |
| 1998 | 42.21 | 14 |
| 1997 | 48.02 | 9 |
| 1996 | 68.82 | 2 |
| 1995 | 62.62 | 3 |
| 1994 | 46.66 | 10 |
| 1993 | 64 | 2 |
| 1992 | 11.89 | 131 |
| 1991 | 30.51 | 62 |
| 1990 | 30 | 63 |
| 1989 | 35.71 | 33 |
| 1988 | 37.04 | 27 |
| 1987 | 40 | 20 |