| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11.94 | 5 |
| 2015 | 8.25 | 17 |
| 2014 | 9.69 | 17 |
| 2013 | 4.53 | 62 |
| 2012 | 4.69 | 50 |
| 2011 | 2.25 | 112 |
| 2010 | -5.2 | 145 |
| 2009 | -6.99 | 153 |
| 2008 | -6.79 | 162 |
| 2007 | 5.65 | 48 |
| 2006 | 11.46 | 11 |
| 2005 | 4.48 | 55 |
| 2004 | -.51 | 137 |
| 2003 | 1.16 | 108 |
| 2002 | -3.61 | 144 |
| 2001 | 2.98 | 75 |
| 2000 | 5.26 | 51 |
| 1999 | 0.15 | 117 |
| 1998 | 0.89 | 95 |
| 1997 | 4.31 | 49 |
| 1996 | 0.93 | 110 |
| 1995 | -1.3 | 102 |
| 1994 | 1.48 | 67 |
| 1993 | 4.3 | 37 |
| 1992 | 6.02 | 34 |
| 1991 | 0.87 | 75 |
| 1990 | -.69 | 80 |
| 1989 | -8.52 | 106 |
| 1988 | 10.55 | 18 |
| 1987 | -1.97 | 78 |
| 1986 | -1.43 | 86 |