| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 20.56 | 3 |
| 2015 | 19.85 | 4 |
| 2014 | 17.04 | 2 |
| 2013 | 24.1 | 6 |
| 2012 | 19.64 | 4 |
| 2011 | 15.01 | 14 |
| 2010 | 10.82 | 31 |
| 2009 | 9.67 | 18 |
| 2008 | 10.13 | 22 |
| 2007 | 9.52 | 37 |
| 2006 | 10.16 | 41 |
| 2005 | 9.43 | 34 |
| 2004 | 11.65 | 26 |
| 2003 | 6.48 | 64 |
| 2002 | 8.33 | 32 |
| 2001 | 5.11 | 52 |
| 2000 | 5.35 | 67 |
| 1999 | 5.48 | 55 |
| 1998 | 5.21 | 57 |
| 1997 | 3.68 | 87 |
| 1996 | 4.34 | 73 |
| 1995 | 8.13 | 33 |
| 1994 | 7.21 | 40 |
| 1993 | 26.9 | 4 |
| 1992 | -19.86 | 120 |
| 1991 | -18.43 | 122 |
| 1990 | -4.87 | 101 |
| 1989 | -1.48 | 98 |
| 1988 | -4.11 | 102 |
| 1987 | 6.06 | 40 |
| 1986 | 4.39 | 52 |