| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.52 | 28 |
| 2015 | 3.67 | 34 |
| 2014 | 3.12 | 35 |
| 2013 | 1.78 | 72 |
| 2012 | 4.92 | 34 |
| 2011 | 4.96 | 35 |
| 2010 | 3.58 | 53 |
| 2009 | -.38 | 80 |
| 2008 | 4.4 | 53 |
| 2007 | 6.14 | 45 |
| 2006 | 3.61 | 66 |
| 2005 | 3.3 | 74 |
| 2004 | 1.05 | 117 |
| 2003 | 2.38 | 70 |
| 2002 | 2.31 | 69 |
| 2001 | 0.57 | 96 |
| 2000 | -1.04 | 102 |
| 1999 | -.71 | 97 |
| 1998 | 2.17 | 76 |
| 1997 | 2.37 | 69 |
| 1996 | -.61 | 105 |
| 1995 | -.34 | 89 |
| 1994 | 2.5 | 45 |
| 1993 | 6.68 | 16 |
| 1992 | 6.83 | 12 |
| 1991 | 0.33 | 62 |
| 1990 | 0.92 | 48 |
| 1989 | 1.92 | 48 |
| 1988 | 0.61 | 60 |
| 1987 | 0.89 | 55 |
| 1986 | 3.39 | 33 |