| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.24 | 67 |
| 2015 | 3.85 | 31 |
| 2014 | 2.57 | 49 |
| 2013 | 4.14 | 42 |
| 2012 | 2.9 | 62 |
| 2011 | 7.67 | 21 |
| 2010 | 5.34 | 33 |
| 2009 | -.04 | 74 |
| 2008 | 1.29 | 90 |
| 2007 | 7.72 | 32 |
| 2006 | 5.42 | 47 |
| 2005 | 3.09 | 80 |
| 2004 | 6.29 | 39 |
| 2003 | -1.36 | 124 |
| 2002 | -1.48 | 117 |
| 2001 | 0.66 | 94 |
| 2000 | 3.6 | 38 |
| 1999 | 0.08 | 93 |
| 1998 | -6.28 | 120 |
| 1997 | 4.66 | 37 |
| 1996 | -.78 | 107 |
| 1995 | -.36 | 90 |
| 1994 | 4.13 | 31 |
| 1993 | 6.01 | 20 |
| 1992 | 7.67 | 10 |
| 1991 | 8.36 | 13 |
| 1990 | 5.92 | 16 |
| 1989 | 2.76 | 39 |
| 1988 | 8.46 | 7 |
| 1987 | 9.54 | 8 |
| 1986 | 7.23 | 16 |