| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.01 | 49 |
| 2015 | 2.62 | 84 |
| 2014 | 5.24 | 56 |
| 2013 | 7.53 | 41 |
| 2012 | 5.2 | 46 |
| 2011 | 4.87 | 77 |
| 2010 | 3.84 | 104 |
| 2009 | 2.9 | 48 |
| 2008 | 10.58 | 20 |
| 2007 | 7 | 68 |
| 2006 | 6.93 | 65 |
| 2005 | 6.47 | 55 |
| 2004 | 6.3 | 67 |
| 2003 | 0.9 | 130 |
| 2002 | 2.68 | 96 |
| 2001 | 0.21 | 118 |
| 2000 | 2.43 | 113 |
| 1999 | -1.96 | 135 |
| 1998 | 7.08 | 40 |
| 1997 | 3.71 | 85 |
| 1996 | 3.06 | 90 |
| 1995 | 6.99 | 39 |
| 1994 | 4.68 | 59 |
| 1993 | 5.43 | 41 |
| 1992 | 1.8 | 65 |
| 1991 | 4.21 | 42 |
| 1990 | 7.09 | 33 |
| 1989 | 7.99 | 25 |
| 1988 | 4.01 | 60 |
| 1987 | 3.6 | 61 |
| 1986 | -9.52 | 106 |