| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.49 | 85 |
| 2014 | 2.24 | 100 |
| 2013 | 4.7 | 56 |
| 2012 | 0.7 | 120 |
| 2011 | 4.32 | 76 |
| 2010 | -5.91 | 151 |
| 2009 | -.21 | 109 |
| 2008 | 0.64 | 125 |
| 2007 | 18.04 | 5 |
| 2006 | -6.05 | 155 |
| 2005 | -11.64 | 164 |
| 2004 | 0.21 | 129 |
| 2003 | 2.39 | 90 |
| 2002 | -2.52 | 137 |
| 2001 | 0.89 | 99 |
| 2000 | 9.12 | 19 |
| 1999 | 11.62 | 15 |
| 1998 | -14.11 | 158 |
| 1997 | 2.34 | 76 |
| 1996 | 17.47 | 12 |
| 1995 | 4.11 | 55 |
| 1994 | -4.92 | 110 |
| 1993 | -22.74 | 132 |
| 1992 | -10.32 | 116 |
| 1991 | -23.99 | 126 |
| 1990 | -8.74 | 107 |
| 1989 | 0.43 | 72 |
| 1988 | 3.45 | 52 |
| 1987 | 2.19 | 55 |
| 1986 | 1.53 | 64 |