| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | -.3 | 116 |
| 2014 | -.72 | 125 |
| 2013 | 2.52 | 60 |
| 2012 | 2.19 | 73 |
| 2011 | -.2 | 119 |
| 2010 | 2.38 | 75 |
| 2009 | -.69 | 87 |
| 2008 | -1.06 | 123 |
| 2007 | 0.82 | 117 |
| 2006 | 0.97 | 115 |
| 2005 | 1.23 | 116 |
| 2004 | 1.28 | 109 |
| 2003 | 0.44 | 104 |
| 2002 | 0.95 | 92 |
| 2001 | 1.65 | 70 |
| 2000 | 1.41 | 82 |
| 1999 | 0.98 | 83 |
| 1998 | -.86 | 106 |
| 1997 | 0.45 | 97 |
| 1996 | 1.83 | 86 |
| 1995 | 2.11 | 55 |
| 1994 | 1.93 | 52 |
| 1993 | 0.76 | 64 |
| 1992 | 1.85 | 44 |
| 1991 | 1.87 | 47 |
| 1990 | 4.84 | 19 |
| 1989 | 4.4 | 23 |
| 1988 | 4.7 | 30 |
| 1987 | 3.85 | 27 |
| 1986 | 3.09 | 38 |