| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.66 | 125 |
| 2015 | 0.84 | 120 |
| 2014 | 1.17 | 118 |
| 2013 | 0.22 | 142 |
| 2012 | 0.3 | 139 |
| 2011 | 5.6 | 34 |
| 2010 | 4.24 | 64 |
| 2009 | -5.38 | 160 |
| 2008 | 1.27 | 122 |
| 2007 | 3.4 | 113 |
| 2006 | 3.82 | 100 |
| 2005 | 0.76 | 161 |
| 2004 | 1.19 | 160 |
| 2003 | -.76 | 174 |
| 2002 | -.17 | 146 |
| 2001 | 1.52 | 102 |
| 2000 | 2.82 | 104 |
| 1999 | 1.92 | 94 |
| 1998 | 1.96 | 109 |
| 1997 | 1.7 | 125 |
| 1996 | 0.53 | 144 |
| 1995 | 1.44 | 116 |
| 1994 | 2.1 | 84 |
| 1993 | -1.61 | 128 |
| 1992 | 1.15 | 75 |
| 1991 | 4.35 | 32 |
| 1990 | 4.35 | 35 |
| 1989 | 3.1 | 61 |
| 1988 | 3.3 | 68 |
| 1987 | 1.25 | 86 |
| 1986 | 2.24 | 71 |