| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.3 | 66 |
| 2015 | 0.72 | 113 |
| 2014 | -.41 | 164 |
| 2013 | 0.61 | 156 |
| 2012 | 2.05 | 144 |
| 2011 | 5.2 | 81 |
| 2010 | 0.78 | 166 |
| 2009 | 6.32 | 47 |
| 2008 | 11.57 | 56 |
| 2007 | 5.58 | 81 |
| 2006 | 3.7 | 102 |
| 2005 | 1.86 | 144 |
| 2004 | 16.31 | 9 |
| 2003 | 0.12 | 158 |
| 2002 | 8.05 | 43 |
| 2001 | 3.84 | 88 |
| 2000 | 0.97 | 136 |
| 1999 | 0.27 | 144 |
| 1998 | 2.22 | 116 |
| 1997 | 6.86 | 73 |
| 1996 | 5.37 | 96 |
| 1995 | -2.9 | 161 |
| 1994 | 12.08 | 72 |
| 1993 | 1.72 | 127 |
| 1992 | 9.03 | 67 |
| 1991 | -1.82 | 135 |
| 1990 | 15.24 | 46 |
| 1989 | 6.46 | 73 |
| 1988 | 8.51 | 58 |
| 1987 | 4.57 | 74 |
| 1986 | 5.73 | 67 |