| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.52 | 34 |
| 2015 | 4.56 | 59 |
| 2014 | 6.68 | 39 |
| 2013 | -.68 | 143 |
| 2012 | -8.08 | 165 |
| 2011 | 23.88 | 4 |
| 2010 | 13.36 | 13 |
| 2009 | 12.82 | 12 |
| 2008 | -4.89 | 162 |
| 2007 | 11.2 | 22 |
| 2006 | 2.35 | 127 |
| 2005 | 1.86 | 131 |
| 2004 | 2.6 | 125 |
| 2003 | 21.67 | 6 |
| 2002 | -9.36 | 159 |
| 2001 | 2.51 | 80 |
| 2000 | -11.67 | 157 |
| 1999 | 37.22 | 2 |
| 1998 | 4.34 | 69 |
| 1997 | 20.4 | 7 |
| 1996 | -.87 | 129 |
| 1995 | 0.2 | 104 |
| 1994 | -4.56 | 115 |
| 1993 | 5.27 | 42 |
| 1992 | 4.16 | 53 |
| 1991 | 0.13 | 81 |
| 1990 | 7.63 | 29 |
| 1989 | -.54 | 92 |
| 1988 | -.95 | 94 |
| 1987 | 8.37 | 29 |
| 1986 | 10.11 | 24 |