| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.26 | 47 |
| 2015 | 4.86 | 40 |
| 2014 | 5.46 | 45 |
| 2013 | 6.8 | 28 |
| 2012 | 5.12 | 57 |
| 2011 | 5.2 | 71 |
| 2010 | 4.13 | 99 |
| 2009 | 3.36 | 49 |
| 2008 | 6.15 | 61 |
| 2007 | 4.56 | 126 |
| 2006 | 4.8 | 123 |
| 2005 | 4.42 | 106 |
| 2004 | 4.17 | 127 |
| 2003 | 2.71 | 134 |
| 2002 | 2.49 | 118 |
| 2001 | 1.68 | 141 |
| 2000 | 2.51 | 145 |
| 1999 | 0.43 | 152 |
| 1998 | 5.03 | 55 |
| 1997 | 4.95 | 84 |
| 1996 | 4.36 | 92 |
| 1995 | 4.68 | 77 |
| 1994 | 4.67 | 69 |
| 1993 | 4.27 | 63 |
| 1992 | 1.65 | 95 |
| 1991 | 5.27 | 44 |
| 1990 | 4.64 | 57 |
| 1989 | 3.79 | 86 |
| 1988 | 2.91 | 108 |
| 1987 | 2.46 | 102 |
| 1986 | -2.57 | 147 |