| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.83 | 116 |
| 2015 | -1.74 | 167 |
| 2014 | -1.31 | 170 |
| 2013 | -.92 | 176 |
| 2012 | 1.5 | 157 |
| 2011 | 3.33 | 133 |
| 2010 | 4.71 | 68 |
| 2009 | 1.21 | 124 |
| 2008 | 4.15 | 150 |
| 2007 | 2.9 | 125 |
| 2006 | 3.2 | 116 |
| 2005 | 3.55 | 99 |
| 2004 | 2.9 | 101 |
| 2003 | 3.53 | 82 |
| 2002 | 3.63 | 74 |
| 2001 | 3.37 | 98 |
| 2000 | 3.17 | 91 |
| 1999 | 2.64 | 92 |
| 1998 | 4.77 | 87 |
| 1997 | 5.54 | 84 |
| 1996 | 8.2 | 73 |
| 1995 | 8.94 | 86 |
| 1994 | 10.92 | 74 |
| 1993 | 14.41 | 49 |
| 1992 | 15.87 | 43 |
| 1991 | 19.47 | 42 |
| 1990 | 20.4 | 34 |
| 1989 | 13.7 | 42 |
| 1988 | 13.53 | 43 |
| 1987 | 16.38 | 32 |
| 1986 | 23.02 | 24 |