| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 3.26 | 50 |
| 2012 | 5.49 | 27 |
| 2011 | 2.49 | 72 |
| 2010 | -3.36 | 149 |
| 2009 | -4.44 | 131 |
| 2008 | 4.62 | 50 |
| 2007 | 14.97 | 9 |
| 2006 | 13.53 | 11 |
| 2005 | 13.74 | 9 |
| 2004 | 13.44 | 6 |
| 2003 | -5.96 | 133 |
| 2002 | -8.79 | 133 |
| 2001 | 4.03 | 34 |
| 2000 | 2.72 | 63 |
| 1999 | -3.58 | 113 |
| 1998 | -.15 | 103 |
| 1997 | 0.64 | 95 |
| 1996 | -6.35 | 120 |
| 1995 | -1.16 | 98 |
| 1994 | -6.49 | 95 |
| 1993 | -2.08 | 81 |
| 1992 | 5.89 | 17 |
| 1991 | 5.48 | 24 |
| 1990 | 0.42 | 56 |
| 1989 | -8.27 | 84 |
| 1988 | 2.41 | 46 |
| 1987 | 1.34 | 49 |
| 1986 | 0.32 | 58 |