| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.8 | 75 |
| 2014 | 1.68 | 78 |
| 2013 | 4.98 | 31 |
| 2012 | 7.26 | 17 |
| 2011 | 6.79 | 27 |
| 2010 | -7.1 | 154 |
| 2009 | 12.27 | 4 |
| 2008 | 11.37 | 11 |
| 2007 | 0.55 | 125 |
| 2006 | 7.45 | 31 |
| 2005 | -.35 | 131 |
| 2004 | 0.75 | 119 |
| 2003 | 6.98 | 27 |
| 2002 | -2.9 | 125 |
| 2001 | 7.07 | 18 |
| 2000 | 3.51 | 40 |
| 1999 | -1.24 | 101 |
| 1998 | 0.71 | 98 |
| 1997 | 4.26 | 40 |
| 1996 | 7.36 | 26 |
| 1995 | 0.02 | 87 |
| 1994 | -2.31 | 86 |
| 1993 | -3.17 | 87 |
| 1992 | -6.48 | 93 |
| 1991 | 10.56 | 11 |
| 1990 | -20.56 | 90 |
| 1989 | -1.37 | 69 |
| 1988 | -10.42 | 82 |
| 1987 | 13.6 | 5 |
| 1986 | 3.81 | 27 |