| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.51 | 65 |
| 2015 | 0.65 | 159 |
| 2014 | 0.5 | 167 |
| 2013 | -.42 | 179 |
| 2012 | 0.21 | 176 |
| 2011 | 0.56 | 168 |
| 2010 | 3.73 | 79 |
| 2009 | 8.31 | 37 |
| 2008 | 3.28 | 116 |
| 2007 | 5.9 | 84 |
| 2006 | 5.75 | 75 |
| 2005 | 5.61 | 59 |
| 2004 | 3.78 | 75 |
| 2003 | 2.66 | 88 |
| 2002 | 3.22 | 79 |
| 2001 | 1.68 | 105 |
| 2000 | 1.42 | 120 |
| 1999 | 0.91 | 123 |
| 1998 | 3.39 | 64 |
| 1997 | 3.7 | 52 |
| 1996 | 3.74 | 34 |
| 1995 | 1.15 | 90 |
| 1994 | 1.79 | 56 |
| 1993 | 1.01 | 82 |
| 1992 | 0.52 | 85 |
| 1991 | 0.62 | 80 |
| 1990 | 0.07 | 119 |
| 1989 | -.02 | 123 |
| 1988 | -.34 | 133 |
| 1987 | -.05 | 124 |
| 1986 | -.03 | 115 |