| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.79 | 55 |
| 2015 | 6.88 | 8 |
| 2014 | 2.8 | 43 |
| 2013 | 2.43 | 62 |
| 2012 | 3.09 | 54 |
| 2011 | 1.39 | 98 |
| 2010 | 4.67 | 40 |
| 2009 | 1.5 | 47 |
| 2008 | 5.38 | 44 |
| 2007 | -1.43 | 137 |
| 2006 | 3 | 75 |
| 2005 | 6.8 | 39 |
| 2004 | 2.4 | 91 |
| 2003 | 6.7 | 30 |
| 2002 | 4.91 | 38 |
| 2001 | 1.16 | 84 |
| 2000 | -2.08 | 110 |
| 1999 | -1.54 | 104 |
| 1998 | 16.15 | 4 |
| 1997 | 6.31 | 23 |
| 1996 | -.61 | 106 |
| 1995 | -7.08 | 113 |
| 1994 | -4.58 | 94 |
| 1993 | 2.12 | 44 |
| 1992 | 5.59 | 19 |
| 1991 | 15.64 | 5 |
| 1990 | -14.47 | 88 |
| 1989 | 21.88 | 2 |
| 1988 | -10.33 | 80 |
| 1987 | -4.63 | 74 |
| 1986 | 1.31 | 52 |