| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.22 | 73 |
| 2015 | 1.22 | 109 |
| 2014 | 3.29 | 86 |
| 2013 | 2.22 | 100 |
| 2012 | 5.38 | 43 |
| 2011 | 1.72 | 128 |
| 2010 | 2.2 | 128 |
| 2009 | 0.73 | 64 |
| 2008 | 4.16 | 74 |
| 2007 | 4.49 | 99 |
| 2006 | 2.85 | 121 |
| 2005 | 2.29 | 121 |
| 2004 | 1.99 | 132 |
| 2003 | 5.83 | 67 |
| 2002 | 3.9 | 80 |
| 2001 | -.93 | 129 |
| 2000 | 3.52 | 98 |
| 1999 | 3.37 | 79 |
| 1998 | 4.82 | 63 |
| 1997 | 1.56 | 108 |
| 1996 | 3.37 | 85 |
| 1995 | 3.98 | 68 |
| 1994 | 4.07 | 69 |
| 1993 | 2.64 | 58 |
| 1992 | -2.15 | 97 |
| 1991 | -1.27 | 91 |
| 1990 | 2.44 | 59 |
| 1989 | 6.49 | 39 |
| 1988 | 8.47 | 31 |
| 1987 | -.11 | 88 |
| 1986 | 3.73 | 60 |