| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 0.88 | 104 |
| 2014 | 1.52 | 83 |
| 2013 | 2.76 | 56 |
| 2012 | 1.71 | 82 |
| 2011 | 2.47 | 73 |
| 2010 | 1.21 | 99 |
| 2009 | 0.39 | 64 |
| 2008 | -1.53 | 128 |
| 2007 | 2.89 | 86 |
| 2006 | 1.79 | 94 |
| 2005 | 3.44 | 70 |
| 2004 | 3.81 | 68 |
| 2003 | 4.13 | 51 |
| 2002 | 3.17 | 53 |
| 2001 | 2.08 | 61 |
| 2000 | 0.81 | 90 |
| 1999 | 2.48 | 62 |
| 1998 | 2.02 | 77 |
| 1997 | 1.38 | 85 |
| 1996 | 3.37 | 61 |
| 1995 | 2.65 | 53 |
| 1994 | 4.98 | 22 |
| 1993 | 2.67 | 38 |
| 1992 | -.72 | 68 |
| 1991 | -7 | 94 |
| 1990 | -.52 | 61 |
| 1989 | 0.53 | 60 |
| 1988 | 2.65 | 44 |
| 1987 | 1.96 | 42 |
| 1986 | 4.14 | 24 |