| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.22 | 132 |
| 2015 | 0.6 | 127 |
| 2014 | 0.78 | 136 |
| 2013 | -.22 | 152 |
| 2012 | 1.41 | 111 |
| 2011 | -.33 | 163 |
| 2010 | -.64 | 169 |
| 2009 | -2.86 | 122 |
| 2008 | -.86 | 164 |
| 2007 | 1.87 | 143 |
| 2006 | 1.57 | 156 |
| 2005 | 1.93 | 140 |
| 2004 | 3.35 | 102 |
| 2003 | 0.33 | 151 |
| 2002 | 0.89 | 125 |
| 2001 | 1.57 | 101 |
| 2000 | 2.54 | 113 |
| 1999 | 1.32 | 113 |
| 1998 | 2.02 | 108 |
| 1997 | 4.72 | 50 |
| 1996 | 4.5 | 54 |
| 1995 | 3.61 | 60 |
| 1994 | 4.46 | 44 |
| 1993 | 2.23 | 67 |
| 1992 | 2.98 | 54 |
| 1991 | 2.59 | 49 |
| 1990 | 1.58 | 77 |
| 1989 | 0.62 | 104 |
| 1988 | -.79 | 128 |
| 1987 | 1.28 | 85 |
| 1986 | 3.67 | 40 |