| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.17 | 21 |
| 2015 | 4.28 | 25 |
| 2014 | 1.91 | 92 |
| 2013 | 1.43 | 111 |
| 2012 | 0.61 | 128 |
| 2011 | 2.57 | 94 |
| 2010 | 0.72 | 149 |
| 2009 | -3.6 | 136 |
| 2008 | 6.39 | 29 |
| 2007 | 8.47 | 29 |
| 2006 | 7.57 | 32 |
| 2005 | 8.05 | 23 |
| 2004 | 7.36 | 36 |
| 2003 | 5.91 | 40 |
| 2002 | 8.34 | 11 |
| 2001 | 6.34 | 20 |
| 2000 | 5.53 | 38 |
| 1999 | -5.08 | 182 |
| 1998 | 4.19 | 48 |
| 1997 | -.5 | 161 |
| 1996 | 2.13 | 110 |
| 1995 | 3.32 | 66 |
| 1994 | 2.16 | 79 |
| 1993 | -.69 | 109 |
| 1992 | -6.27 | 151 |
| 1991 | -7.53 | 158 |
| 1990 | -7.46 | 157 |
| 1989 | -2.15 | 135 |
| 1988 | 10.82 | 8 |
| 1987 | 5.9 | 32 |
| 1986 | 4.24 | 35 |