| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.54 | 97 |
| 2014 | 2.63 | 105 |
| 2013 | 2.1 | 115 |
| 2012 | 1.94 | 123 |
| 2011 | 2.35 | 114 |
| 2010 | 2.1 | 124 |
| 2009 | 2.58 | 104 |
| 2008 | 3.38 | 114 |
| 2007 | 3.11 | 130 |
| 2006 | 3.09 | 121 |
| 2005 | 1.93 | 128 |
| 2004 | 1.71 | 121 |
| 2003 | 1.26 | 129 |
| 2002 | 1.54 | 116 |
| 2001 | 0.92 | 131 |
| 2000 | 1.74 | 114 |
| 1999 | 2.98 | 81 |
| 1998 | 1.4 | 121 |
| 1997 | 3.77 | 50 |
| 1996 | 0.17 | 153 |
| 1995 | 0.65 | 111 |
| 1994 | 1.72 | 60 |
| 1993 | -.01 | 146 |
| 1992 | 0.36 | 96 |
| 1991 | -.13 | 140 |
| 1990 | 1 | 66 |
| 1989 | 0.55 | 74 |
| 1988 | 0.3 | 89 |
| 1987 | -.08 | 125 |
| 1986 | -.2 | 123 |