| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.82 | 50 |
| 2015 | 0.99 | 113 |
| 2014 | 1.15 | 120 |
| 2013 | -.21 | 151 |
| 2012 | 3.31 | 59 |
| 2011 | 3.36 | 73 |
| 2010 | 5.22 | 43 |
| 2009 | -.11 | 77 |
| 2008 | 4.1 | 66 |
| 2007 | 2.52 | 134 |
| 2006 | 3.12 | 116 |
| 2005 | 5.49 | 48 |
| 2004 | 1.46 | 152 |
| 2003 | 4.72 | 54 |
| 2002 | 1.39 | 108 |
| 2001 | 3.61 | 45 |
| 2000 | -1.03 | 165 |
| 1999 | 4.42 | 41 |
| 1998 | 4.34 | 45 |
| 1997 | 3.4 | 76 |
| 1996 | 7.99 | 17 |
| 1995 | 2.85 | 74 |
| 1994 | -1.41 | 141 |
| 1993 | 0.7 | 90 |
| 1992 | -2.43 | 129 |
| 1991 | 6.19 | 18 |
| 1990 | -3.21 | 134 |
| 1989 | -.51 | 121 |
| 1988 | 3.06 | 78 |
| 1987 | -2.8 | 136 |
| 1986 | 5.19 | 28 |