| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0 | 159 |
| 2015 | 3.01 | 91 |
| 2014 | 4.8 | 53 |
| 2013 | 6.81 | 27 |
| 2012 | 5.16 | 55 |
| 2011 | 3.92 | 98 |
| 2010 | 3.41 | 116 |
| 2009 | 2.41 | 69 |
| 2008 | 13.82 | 5 |
| 2007 | 22.59 | 2 |
| 2006 | 20.74 | 3 |
| 2005 | 18.26 | 2 |
| 2004 | 10.88 | 14 |
| 2003 | 5.25 | 74 |
| 2002 | -6.94 | 193 |
| 2001 | 4.22 | 67 |
| 2000 | 3.01 | 137 |
| 1999 | 3.24 | 102 |
| 1998 | 6.8 | 33 |
| 1997 | 7.9 | 31 |
| 1996 | 11.2 | 11 |
| 1995 | 10.4 | 10 |
| 1994 | 3.5 | 98 |
| 1993 | -24.7 | 179 |
| 1992 | -6.9 | 157 |
| 1991 | -1.2 | 141 |
| 1990 | -.3 | 127 |
| 1989 | 0.4 | 131 |
| 1988 | 5.6 | 67 |
| 1987 | 7.9 | 28 |
| 1986 | 2.8 | 94 |