| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.26 | 14 |
| 2015 | 4.38 | 22 |
| 2014 | 4.43 | 25 |
| 2013 | 5.31 | 20 |
| 2012 | 4.93 | 34 |
| 2011 | 1.97 | 112 |
| 2010 | 5.9 | 32 |
| 2009 | -.46 | 85 |
| 2008 | 2.48 | 93 |
| 2007 | 4.84 | 85 |
| 2006 | 3.4 | 109 |
| 2005 | 2.84 | 108 |
| 2004 | 4.62 | 76 |
| 2003 | 2.85 | 94 |
| 2002 | 1.5 | 102 |
| 2001 | 0.73 | 125 |
| 2000 | 2.19 | 124 |
| 1999 | 0.86 | 124 |
| 1998 | -2.74 | 171 |
| 1997 | 2.86 | 92 |
| 1996 | 3.46 | 76 |
| 1995 | 2.28 | 96 |
| 1994 | 1.96 | 88 |
| 1993 | -.3 | 101 |
| 1992 | -2.08 | 126 |
| 1991 | -3.02 | 135 |
| 1990 | 0.45 | 97 |
| 1989 | 3.49 | 52 |
| 1988 | 3.97 | 60 |
| 1987 | 1.56 | 79 |
| 1986 | 0.67 | 102 |