| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.93 | 29 |
| 2015 | 10.33 | 14 |
| 2014 | 6.18 | 33 |
| 2013 | 31.53 | 2 |
| 2012 | 4.4 | 59 |
| 2011 | 5.98 | 38 |
| 2010 | 6.57 | 34 |
| 2009 | 0.72 | 126 |
| 2008 | 3.02 | 95 |
| 2007 | 5.78 | 61 |
| 2006 | 12.43 | 14 |
| 2005 | 8.99 | 32 |
| 2004 | 7.98 | 26 |
| 2003 | 3.12 | 69 |
| 2002 | -11.31 | 142 |
| 2001 | 12.14 | 15 |
| 2000 | 15.82 | 8 |
| 1999 | -14.64 | 128 |
| 1998 | 6.58 | 31 |
| 1997 | 1.01 | 91 |
| 1996 | 4.52 | 41 |
| 1995 | 2.3 | 63 |
| 1994 | 15.25 | 9 |
| 1993 | -1.99 | 95 |
| 1992 | -1.68 | 87 |
| 1991 | 6.02 | 32 |
| 1990 | 4 | 37 |
| 1989 | -.93 | 78 |
| 1988 | 4.06 | 30 |
| 1987 | 7.25 | 18 |
| 1986 | 8.16 | 17 |