| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.01 | 114 |
| 2014 | 0.96 | 156 |
| 2013 | 1.78 | 125 |
| 2012 | 2.81 | 105 |
| 2011 | 2.04 | 128 |
| 2010 | 2.68 | 108 |
| 2009 | 1.21 | 143 |
| 2008 | 2.69 | 129 |
| 2007 | 2.25 | 145 |
| 2006 | 2.38 | 130 |
| 2005 | 2.65 | 105 |
| 2004 | 2.51 | 102 |
| 2003 | 1.29 | 127 |
| 2002 | 2.2 | 103 |
| 2001 | 0.81 | 135 |
| 2000 | 3.67 | 77 |
| 1999 | 8.46 | 28 |
| 1998 | 2.44 | 91 |
| 1997 | 3.13 | 63 |
| 1996 | 2.55 | 54 |
| 1995 | 2.17 | 61 |
| 1994 | 1.41 | 73 |
| 1993 | 1.18 | 76 |
| 1992 | 1.94 | 41 |
| 1991 | 1.29 | 52 |
| 1990 | 1.3 | 52 |
| 1989 | 1.34 | 45 |
| 1988 | 0.91 | 52 |
| 1987 | -.02 | 122 |
| 1986 | 0.52 | 63 |