| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 22.39 | 4 |
| 2015 | 28.4 | 6 |
| 2014 | 2.88 | 96 |
| 2013 | 5.7 | 46 |
| 2012 | 36.14 | 6 |
| 2011 | 82.12 | 2 |
| 2010 | 105.79 | 1 |
| 2009 | 16.93 | 9 |
| 2008 | 165.28 | 1 |
| 2007 | 451.72 | 1 |
| 2006 | 370.34 | 2 |
| 2005 | 341.1 | 1 |
| 2004 | 123.1 | 1 |
| 2003 | 16.7 | 9 |
| 2002 | -10.61 | 186 |
| 2001 | 9.62 | 16 |
| 2000 | 17.26 | 6 |
| 1999 | 20.77 | 7 |
| 1998 | 7.22 | 29 |
| 1997 | 2.22 | 86 |
| 1996 | 8.21 | 14 |
| 1995 | 3.76 | 39 |
| 1994 | 5.06 | 18 |
| 1993 | 2.08 | 44 |
| 1992 | 1.31 | 57 |
| 1991 | 2.8 | 30 |
| 1990 | 1.8 | 44 |
| 1989 | 2.44 | 30 |
| 1988 | 2.02 | 27 |
| 1987 | 1.11 | 46 |
| 1986 | 1.52 | 29 |