| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.66 | 46 |
| 2015 | 6.71 | 26 |
| 2014 | 0.06 | 132 |
| 2013 | -.06 | 133 |
| 2012 | -4 | 148 |
| 2011 | 11.01 | 21 |
| 2010 | 0.95 | 90 |
| 2009 | -5.07 | 148 |
| 2008 | 6.83 | 51 |
| 2007 | 2.27 | 100 |
| 2006 | 8.95 | 16 |
| 2005 | 12.72 | 11 |
| 2004 | 13.25 | 19 |
| 2003 | 2 | 98 |
| 2002 | 4.13 | 59 |
| 2001 | 4.31 | 57 |
| 2000 | 7.1 | 29 |
| 1999 | -2 | 129 |
| 1998 | 5.41 | 39 |
| 1997 | 4.51 | 44 |
| 1996 | 2.8 | 84 |
| 1995 | 6.92 | 30 |
| 1994 | 7.54 | 23 |
| 1993 | 3.12 | 49 |
| 1992 | 12 | 13 |
| 1991 | 2.43 | 57 |
| 1990 | 9.11 | 19 |
| 1989 | 6.25 | 26 |
| 1988 | 11.51 | 14 |
| 1987 | 9.52 | 17 |
| 1986 | 7.62 | 19 |