| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.83 | 63 |
| 2015 | 3.88 | 65 |
| 2014 | 4.02 | 77 |
| 2013 | 10.92 | 7 |
| 2012 | -.09 | 161 |
| 2011 | 5.96 | 60 |
| 2010 | -.47 | 177 |
| 2009 | 2.89 | 62 |
| 2008 | 8.4 | 24 |
| 2007 | 8.54 | 42 |
| 2006 | 3.1 | 156 |
| 2005 | -.18 | 196 |
| 2004 | 7.03 | 54 |
| 2003 | 7.03 | 44 |
| 2002 | -.02 | 171 |
| 2001 | 5.32 | 43 |
| 2000 | 5.43 | 66 |
| 1999 | 3.66 | 88 |
| 1998 | 2.12 | 142 |
| 1997 | 9.92 | 17 |
| 1996 | 7.08 | 40 |
| 1995 | -5.42 | 176 |
| 1994 | -20.09 | 179 |
| 1993 | -15.46 | 175 |
| 1992 | -13.89 | 170 |
| 1991 | -7.85 | 163 |
| 1990 | 5.7 | 41 |
| 1989 | 2.79 | 104 |
| 1988 | 13.2 | 9 |
| 1987 | 3.3 | 84 |