| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2008 | 33.97 | 109 |
| 2007 | 39.74 | 97 |
| 2006 | 42.49 | 84 |
| 2005 | 43.78 | 82 |
| 2004 | 45.35 | 76 |
| 2003 | 44.88 | 77 |
| 2002 | 44.04 | 73 |
| 2001 | 37.16 | 88 |
| 2000 | 34.59 | 83 |
| 1999 | 35.51 | 80 |
| 1998 | 33.58 | 83 |
| 1997 | 32.72 | 86 |
| 1996 | 28.22 | 91 |
| 1995 | 29.17 | 88 |
| 1994 | 32 | 79 |
| 1993 | 27.59 | 93 |
| 1992 | 32.54 | 76 |
| 1991 | 29.8 | 79 |
| 1990 | 28.43 | 79 |
| 1989 | 25.16 | 87 |
| 1988 | 22.9 | 90 |
| 1987 | 21.36 | 96 |
| 1986 | 21.62 | 92 |