| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.19 | 44 |
| 2015 | 2.06 | 66 |
| 2014 | 2.55 | 50 |
| 2013 | 4.33 | 37 |
| 2012 | 6.01 | 25 |
| 2011 | 5.81 | 31 |
| 2010 | 7.72 | 19 |
| 2009 | 1.79 | 42 |
| 2008 | 7.57 | 22 |
| 2007 | 7.33 | 37 |
| 2006 | 4.92 | 52 |
| 2005 | 2.39 | 97 |
| 2004 | 2.13 | 98 |
| 2003 | 1.23 | 95 |
| 2002 | 3.53 | 47 |
| 2001 | -.33 | 110 |
| 2000 | 1.13 | 86 |
| 1999 | -2.83 | 110 |
| 1998 | -3.42 | 115 |
| 1997 | 2.01 | 73 |
| 1996 | 0.68 | 97 |
| 1995 | 7.61 | 22 |
| 1994 | 7.44 | 12 |
| 1993 | 2.42 | 39 |
| 1992 | -2.72 | 79 |
| 1991 | 1.59 | 53 |
| 1990 | -2.64 | 68 |
| 1989 | -18.14 | 89 |
| 1988 | -10.35 | 81 |
| 1987 | 8.82 | 10 |
| 1986 | 12.41 | 7 |