| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.78 | 46 |
| 2015 | 2.3 | 80 |
| 2014 | 1.39 | 97 |
| 2013 | 0.61 | 114 |
| 2012 | 3.91 | 61 |
| 2011 | 3.39 | 61 |
| 2010 | 1.78 | 87 |
| 2009 | 4.25 | 78 |
| 2008 | 3.16 | 92 |
| 2007 | 3.13 | 89 |
| 2006 | 3.07 | 90 |
| 2005 | 3.15 | 75 |
| 2004 | 4.16 | 57 |
| 2003 | 2.97 | 73 |
| 2002 | 3.07 | 77 |
| 2001 | 1.72 | 103 |
| 2000 | 3.21 | 62 |
| 1999 | 4.31 | 43 |
| 1998 | 4.06 | 44 |
| 1997 | 1.99 | 78 |
| 1996 | 4.19 | 45 |
| 1995 | 3.37 | 46 |
| 1994 | 1.09 | 68 |
| 1993 | 2.54 | 57 |
| 1992 | 2.55 | 53 |
| 1991 | 3.2 | 52 |
| 1990 | 2.65 | 48 |
| 1989 | 2.94 | 52 |
| 1988 | 3.76 | 37 |
| 1987 | 3.39 | 41 |
| 1986 | 4.34 | 37 |