| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.71 | 147 |
| 2015 | 0.54 | 128 |
| 2014 | 5.86 | 16 |
| 2013 | 9.51 | 3 |
| 2012 | 10.22 | 6 |
| 2011 | 15.22 | 2 |
| 2010 | 4.63 | 53 |
| 2009 | -2.75 | 121 |
| 2008 | 7.39 | 20 |
| 2007 | 8.82 | 22 |
| 2006 | 7.22 | 36 |
| 2005 | 6 | 41 |
| 2004 | 9.4 | 16 |
| 2003 | 5.89 | 41 |
| 2002 | 3.71 | 52 |
| 2001 | 2 | 85 |
| 2000 | 0.25 | 155 |
| 1999 | 2.18 | 88 |
| 1998 | 2.47 | 99 |
| 1997 | 3.05 | 86 |
| 1996 | 1.42 | 123 |
| 1995 | 5.56 | 33 |
| 1994 | 1.36 | 99 |
| 1993 | -4.01 | 151 |
| 1992 | -10.29 | 163 |
| 1991 | -10.08 | 164 |
| 1990 | -5.1 | 151 |
| 1989 | 1.68 | 83 |
| 1988 | 2.27 | 92 |
| 1987 | 0.56 | 96 |
| 1986 | 6.36 | 21 |