| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.82 | 83 |
| 2015 | 1.79 | 86 |
| 2014 | 1.73 | 96 |
| 2013 | 0.7 | 132 |
| 2012 | 1.32 | 116 |
| 2011 | 0.93 | 140 |
| 2010 | 1.76 | 122 |
| 2009 | -.1 | 76 |
| 2008 | 0.71 | 139 |
| 2007 | 1.8 | 146 |
| 2006 | 0.21 | 179 |
| 2005 | 4.45 | 72 |
| 2004 | 2.94 | 117 |
| 2003 | 5.85 | 42 |
| 2002 | 4.28 | 44 |
| 2001 | 1.68 | 96 |
| 2000 | 2.43 | 118 |
| 1999 | 1.76 | 98 |
| 1998 | 3.54 | 63 |
| 1997 | -.51 | 163 |
| 1996 | 2.31 | 103 |
| 1995 | 1.85 | 103 |
| 1994 | -2.91 | 156 |
| 1993 | -4.23 | 153 |
| 1992 | -.55 | 104 |
| 1991 | -3.59 | 143 |
| 1990 | -1.75 | 118 |
| 1989 | 1.65 | 84 |
| 1988 | -3.71 | 149 |
| 1987 | -3.51 | 139 |
| 1986 | -2.52 | 134 |