| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 15.13 | 6 |
| 2015 | 8.13 | 23 |
| 2014 | 1.5 | 94 |
| 2013 | 10.07 | 24 |
| 2012 | 7.35 | 35 |
| 2011 | 0.02 | 110 |
| 2010 | -.58 | 130 |
| 2009 | 12.66 | 31 |
| 2008 | -.93 | 143 |
| 2007 | -1.08 | 140 |
| 2006 | 48.32 | 1 |
| 2005 | 1.67 | 102 |
| 2004 | 1.43 | 100 |
| 2003 | 7.2 | 29 |
| 2002 | 15.03 | 11 |
| 2001 | -5.63 | 138 |
| 2000 | 7.52 | 26 |
| 1999 | -6.92 | 123 |
| 1998 | 6.82 | 27 |
| 1997 | -8.36 | 129 |
| 1996 | 6.81 | 29 |
| 1995 | 5.47 | 32 |
| 1994 | -10.21 | 110 |
| 1993 | 17.76 | 7 |
| 1992 | -7.87 | 100 |
| 1991 | -.5 | 87 |
| 1990 | -3.17 | 83 |
| 1989 | 20.41 | 3 |
| 1988 | 4.36 | 27 |
| 1987 | 13.24 | 7 |
| 1986 | 10.03 | 11 |