| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.32 | 86 |
| 2015 | -.83 | 121 |
| 2014 | 2.62 | 48 |
| 2013 | 5.18 | 28 |
| 2012 | 4.59 | 40 |
| 2011 | 6.8 | 26 |
| 2010 | 9.02 | 16 |
| 2009 | 1.93 | 40 |
| 2008 | 8.73 | 17 |
| 2007 | 6.81 | 39 |
| 2006 | 6.28 | 38 |
| 2005 | 3.2 | 77 |
| 2004 | 10.65 | 15 |
| 2003 | 2.1 | 78 |
| 2002 | -16.89 | 137 |
| 2001 | -2.17 | 121 |
| 2000 | -1.93 | 109 |
| 1999 | -2.05 | 106 |
| 1998 | 6.1 | 26 |
| 1997 | 5.11 | 32 |
| 1996 | 7.5 | 24 |
| 1995 | -4.37 | 110 |
| 1994 | 8.09 | 10 |
| 1993 | 5.02 | 25 |
| 1992 | 13.56 | 4 |
| 1991 | 4.3 | 28 |
| 1990 | -4.26 | 73 |
| 1989 | 0.11 | 64 |
| 1988 | -1.02 | 69 |
| 1987 | 15.09 | 4 |
| 1986 | 11.81 | 9 |