| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.92 | 44 |
| 2015 | 7.04 | 30 |
| 2014 | 8.42 | 19 |
| 2013 | 2.19 | 79 |
| 2012 | 3.16 | 76 |
| 2011 | 3.81 | 56 |
| 2010 | 4.58 | 47 |
| 2009 | 5.72 | 63 |
| 2008 | 2.17 | 107 |
| 2007 | 0.26 | 134 |
| 2006 | 2.98 | 91 |
| 2005 | 2.74 | 84 |
| 2004 | 2.04 | 89 |
| 2003 | 2.7 | 78 |
| 2002 | 2.63 | 87 |
| 2001 | 4.89 | 51 |
| 2000 | 2.83 | 69 |
| 1999 | 2.58 | 72 |
| 1998 | 2.99 | 67 |
| 1997 | 5.11 | 38 |
| 1996 | 5.39 | 34 |
| 1995 | 5.03 | 33 |
| 1994 | 4.61 | 25 |
| 1993 | 4.83 | 39 |
| 1992 | 5.98 | 27 |
| 1991 | 2.33 | 65 |
| 1990 | -7.12 | 88 |
| 1989 | -5.12 | 90 |
| 1988 | 1.08 | 61 |
| 1987 | 3.05 | 46 |
| 1986 | 0.71 | 75 |