| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.68 | 76 |
| 2014 | -.81 | 127 |
| 2013 | 0.95 | 97 |
| 2012 | 1.13 | 94 |
| 2011 | -2.69 | 139 |
| 2010 | 7.55 | 21 |
| 2009 | 2.82 | 33 |
| 2008 | -1.25 | 125 |
| 2007 | -.87 | 135 |
| 2006 | 3.1 | 74 |
| 2005 | 9.92 | 21 |
| 2004 | 7.22 | 34 |
| 2003 | -.79 | 120 |
| 2002 | 0.43 | 98 |
| 2001 | 0.73 | 91 |
| 2000 | 19.8 | 3 |
| 1999 | 3.05 | 50 |
| 1998 | 4.79 | 37 |
| 1997 | -1.29 | 109 |
| 1996 | 10.55 | 11 |
| 1995 | 22.94 | 4 |
| 1994 | -14.11 | 106 |
| 1993 | 9.64 | 8 |
| 1992 | 4.08 | 23 |
| 1991 | 1.89 | 46 |
| 1990 | 20.64 | 2 |
| 1989 | 3.26 | 29 |
| 1988 | -18.75 | 88 |
| 1987 | -2.3 | 70 |
| 1986 | -20.68 | 85 |