| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.14 | 34 |
| 2015 | 4.52 | 49 |
| 2014 | 4.41 | 47 |
| 2013 | 2.85 | 70 |
| 2012 | 3.71 | 63 |
| 2011 | 2.45 | 71 |
| 2010 | 3.75 | 60 |
| 2009 | 8.42 | 46 |
| 2008 | 0.32 | 133 |
| 2007 | 7.08 | 46 |
| 2006 | 6.4 | 51 |
| 2005 | 5.86 | 47 |
| 2004 | 6.01 | 40 |
| 2003 | 0.83 | 109 |
| 2002 | 2.28 | 92 |
| 2001 | 2.42 | 94 |
| 2000 | 2.32 | 75 |
| 1999 | 2.14 | 81 |
| 1998 | 1.76 | 89 |
| 1997 | 5.2 | 36 |
| 1996 | 3.98 | 50 |
| 1995 | 4.17 | 37 |
| 1994 | 1.94 | 60 |
| 1993 | 4.31 | 41 |
| 1992 | 5.59 | 31 |
| 1991 | 3.58 | 47 |
| 1990 | 0.83 | 64 |
| 1989 | 3.76 | 42 |
| 1988 | 3.59 | 41 |
| 1987 | -2.58 | 81 |
| 1986 | 1.09 | 71 |