| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.9 | 26 |
| 2015 | -.85 | 123 |
| 2014 | 2.09 | 105 |
| 2013 | 2.85 | 91 |
| 2012 | 7.84 | 21 |
| 2011 | -3.22 | 164 |
| 2010 | 11.5 | 14 |
| 2009 | -9.28 | 162 |
| 2008 | 19.61 | 11 |
| 2007 | -4.27 | 143 |
| 2006 | 4.02 | 71 |
| 2005 | 10.46 | 19 |
| 2004 | -3.36 | 157 |
| 2003 | 7.38 | 36 |
| 2002 | 5.8 | 39 |
| 2001 | 11.04 | 21 |
| 2000 | 4.51 | 57 |
| 1999 | 1.4 | 105 |
| 1998 | 16.55 | 7 |
| 1997 | -3.9 | 132 |
| 1996 | 12.54 | 19 |
| 1995 | 6.36 | 36 |
| 1994 | 0.53 | 81 |
| 1993 | 9.82 | 17 |
| 1992 | 2.56 | 62 |
| 1991 | 20.62 | 3 |
| 1990 | -6.53 | 101 |
| 1989 | -1.37 | 86 |
| 1988 | 17.94 | 10 |
| 1987 | -10.16 | 103 |
| 1986 | 12.55 | 12 |