| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.8 | 10 |
| 2015 | -1 | 125 |
| 2014 | 14.34 | 9 |
| 2013 | -.02 | 132 |
| 2012 | 10.09 | 16 |
| 2011 | 5 | 62 |
| 2010 | 1.43 | 85 |
| 2009 | -26.4 | 177 |
| 2008 | 16.34 | 17 |
| 2007 | 2.12 | 104 |
| 2006 | -5.25 | 147 |
| 2005 | 10.05 | 21 |
| 2004 | 3.37 | 90 |
| 2003 | -1.63 | 128 |
| 2002 | 0.32 | 107 |
| 2001 | 5.59 | 48 |
| 2000 | -4.74 | 137 |
| 1999 | 5.48 | 52 |
| 1998 | -2.76 | 126 |
| 1997 | 4.46 | 46 |
| 1996 | 16.37 | 15 |
| 1995 | 5.54 | 43 |
| 1994 | -.06 | 87 |
| 1993 | 5.99 | 30 |
| 1992 | 1.22 | 73 |
| 1991 | -1.14 | 87 |
| 1990 | 2.99 | 57 |
| 1989 | 5.5 | 33 |
| 1988 | 9.26 | 24 |
| 1987 | 0.2 | 69 |
| 1986 | 1.47 | 65 |