| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.71 | 115 |
| 2015 | 1.15 | 110 |
| 2014 | 0.63 | 121 |
| 2013 | 4.31 | 69 |
| 2012 | 4.79 | 55 |
| 2011 | 2.87 | 112 |
| 2010 | 3.06 | 114 |
| 2009 | -2.78 | 91 |
| 2008 | 1.52 | 107 |
| 2007 | 0.49 | 133 |
| 2006 | 3.98 | 107 |
| 2005 | 1.46 | 135 |
| 2004 | 3.81 | 101 |
| 2003 | 1.89 | 114 |
| 2002 | 0.23 | 123 |
| 2001 | 1.71 | 92 |
| 2000 | 4.28 | 86 |
| 1999 | 1.09 | 109 |
| 1998 | 4.22 | 71 |
| 1997 | 7.59 | 40 |
| 1996 | 6.64 | 44 |
| 1995 | 8.37 | 32 |
| 1994 | 4.48 | 64 |
| 1993 | 7.64 | 25 |
| 1992 | 9.25 | 27 |
| 1991 | 7.36 | 27 |
| 1990 | 1.67 | 68 |
| 1989 | 8.72 | 22 |
| 1988 | 8.27 | 32 |
| 1987 | 4.22 | 53 |
| 1986 | 5.79 | 42 |