| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.46 | 99 |
| 2014 | 2.68 | 103 |
| 2013 | 2.43 | 107 |
| 2012 | 2.36 | 111 |
| 2011 | 2.04 | 129 |
| 2010 | 3.03 | 98 |
| 2009 | 0.45 | 164 |
| 2008 | 1.6 | 149 |
| 2007 | 5.5 | 92 |
| 2006 | 5.77 | 74 |
| 2005 | 6.03 | 51 |
| 2004 | 6.77 | 42 |
| 2003 | 3.42 | 67 |
| 2002 | 0.09 | 171 |
| 2001 | 1.15 | 123 |
| 2000 | -.49 | 171 |
| 1999 | -1.17 | 173 |
| 1998 | 0.34 | 151 |
| 1997 | 0.29 | 154 |
| 1996 | 0.41 | 140 |
| 1995 | 0.61 | 115 |
| 1994 | 0.11 | 134 |
| 1993 | 0.72 | 96 |
| 1992 | 0.24 | 108 |
| 1991 | 0.05 | 123 |
| 1990 | -.23 | 137 |
| 1989 | 0.09 | 108 |
| 1988 | 0.52 | 69 |
| 1987 | 0.13 | 99 |
| 1986 | 0.32 | 80 |