| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.92 | 2 |
| 2015 | 71.71 | 1 |
| 2014 | 33.86 | 4 |
| 2013 | 20.88 | 7 |
| 2012 | 18.14 | 13 |
| 2011 | 9.84 | 30 |
| 2010 | 17.06 | 12 |
| 2009 | 22.88 | 4 |
| 2008 | 8.46 | 48 |
| 2007 | 22.2 | 14 |
| 2006 | 9.51 | 40 |
| 2005 | 22.22 | 8 |
| 2004 | -5.67 | 189 |
| 2003 | 13.64 | 14 |
| 2002 | 23.04 | 3 |
| 2001 | 8.77 | 20 |
| 2000 | 25.54 | 3 |
| 1999 | 18.55 | 9 |
| 1998 | 12.25 | 8 |
| 1997 | 3.31 | 60 |
| 1996 | 3.45 | 37 |
| 1995 | 2.09 | 65 |
| 1994 | 1.47 | 65 |
| 1993 | 2.14 | 40 |
| 1992 | 2.58 | 33 |
| 1991 | 2.72 | 32 |
| 1990 | 1.27 | 54 |
| 1989 | 0.22 | 101 |
| 1988 | 0.24 | 92 |
| 1987 | 0.26 | 90 |
| 1986 | -.14 | 120 |