| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.44 | 13 |
| 2015 | 7.55 | 27 |
| 2014 | 3.27 | 61 |
| 2013 | 5 | 51 |
| 2012 | 15.47 | 12 |
| 2011 | 2.09 | 81 |
| 2010 | 4 | 53 |
| 2009 | 10.91 | 36 |
| 2008 | 0.29 | 134 |
| 2007 | 6.9 | 48 |
| 2006 | 10.61 | 21 |
| 2005 | 2.06 | 95 |
| 2004 | 2 | 90 |
| 2003 | 3.6 | 61 |
| 2002 | -3.97 | 131 |
| 2001 | -1.6 | 126 |
| 2000 | -.96 | 113 |
| 1999 | -3.63 | 117 |
| 1998 | -1.95 | 108 |
| 1997 | 4.63 | 42 |
| 1996 | 4.13 | 46 |
| 1995 | 5.56 | 31 |
| 1994 | 6.12 | 22 |
| 1993 | 6.16 | 30 |
| 1992 | -.88 | 82 |
| 1991 | -2.13 | 96 |
| 1990 | 6.75 | 15 |
| 1989 | 6.99 | 24 |
| 1988 | 9.06 | 9 |
| 1987 | 4.86 | 32 |
| 1986 | 0.34 | 78 |