| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2011 | 131.72 | 9 |
| 2010 | 47.64 | 86 |
| 2009 | 57.44 | 65 |
| 2008 | 36.25 | 101 |
| 2007 | 30.39 | 120 |
| 2006 | 26 | 123 |
| 2005 | 26.56 | 118 |
| 2004 | 29.62 | 109 |
| 2003 | 33.34 | 99 |
| 2002 | 40.46 | 82 |
| 2001 | 48.06 | 63 |
| 2000 | 48.51 | 54 |
| 1999 | 55.27 | 45 |
| 1998 | 67.39 | 29 |
| 1997 | 58.47 | 38 |
| 1996 | 70.53 | 24 |
| 1995 | 79.62 | 15 |
| 1994 | 77.87 | 15 |
| 1993 | 72.96 | 19 |
| 1992 | 67.35 | 25 |
| 1991 | 61.42 | 26 |
| 1990 | 68.14 | 20 |