| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.566 | 38 |
| 2015 | 5.602 | 45 |
| 2014 | 4.898 | 54 |
| 2013 | 4.648 | 57 |
| 2012 | 4.45 | 66 |
| 2011 | 4.555 | 61 |
| 2010 | 4.166 | 71 |
| 2009 | 4.401 | 83 |
| 2008 | 3.231 | 126 |
| 2007 | 2.361 | 151 |
| 2006 | 1.831 | 152 |
| 2005 | 2.843 | 115 |
| 2004 | 6.199 | 51 |
| 2003 | 29.688 | 3 |
| 2002 | 62.576 | 1 |
| 2001 | 21.595 | 8 |
| 2000 | 18.262 | 12 |
| 1999 | 21.49 | 16 |
| 1998 | 22.762 | 16 |
| 1997 | 29.575 | 9 |
| 1996 | 42.433 | 6 |
| 1995 | 57.679 | 8 |
| 1994 | 55.781 | 8 |
| 1993 | 59.401 | 8 |
| 1992 | 82.151 | 5 |
| 1991 | 113.472 | 5 |
| 1990 | 147.547 | 5 |
| 1989 | 127.751 | 7 |
| 1988 | 102.286 | 6 |
| 1987 | 91.753 | 5 |
| 1986 | 93.06 | 4 |