| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.28 | 56 |
| 2015 | -.86 | 137 |
| 2014 | 6.61 | 40 |
| 2013 | 2.42 | 95 |
| 2012 | -2.34 | 141 |
| 2011 | 1.75 | 127 |
| 2010 | -3.52 | 158 |
| 2009 | -4.64 | 100 |
| 2008 | 18.2 | 8 |
| 2007 | 9.41 | 38 |
| 2006 | 7.84 | 55 |
| 2005 | 11.17 | 25 |
| 2004 | 7.27 | 60 |
| 2003 | 1.19 | 127 |
| 2002 | 6.04 | 51 |
| 2001 | -8.86 | 154 |
| 2000 | 8.06 | 43 |
| 1999 | 2.24 | 96 |
| 1998 | 11.57 | 15 |
| 1997 | 1.09 | 115 |
| 1996 | 14.5 | 12 |
| 1995 | 7.51 | 36 |
| 1994 | 18.9 | 4 |
| 1993 | 3.67 | 51 |
| 1992 | 15.53 | 10 |
| 1991 | 2.94 | 56 |
| 1990 | 1.1 | 77 |
| 1989 | 10.46 | 15 |
| 1988 | 3.22 | 64 |
| 1987 | 11.44 | 16 |
| 1986 | 2.05 | 70 |