| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.69 | 11 |
| 2015 | 5.14 | 52 |
| 2014 | 2.53 | 97 |
| 2013 | 8.1 | 35 |
| 2012 | 15.65 | 8 |
| 2011 | 7.24 | 52 |
| 2010 | 5.07 | 83 |
| 2009 | 2.86 | 49 |
| 2008 | 12.34 | 19 |
| 2007 | 7.14 | 64 |
| 2006 | 5.83 | 82 |
| 2005 | -2.78 | 157 |
| 2004 | 40.4 | 2 |
| 2003 | -38.57 | 170 |
| 2002 | -12.05 | 162 |
| 2001 | 1.66 | 94 |
| 2000 | 2.23 | 114 |
| 1999 | 19.44 | 8 |
| 1998 | 55.99 | 2 |
| 1997 | 99.14 | 1 |
| 1996 | 8.45 | 25 |
| 1995 | 14.71 | 11 |
| 1994 | 12.34 | 14 |
| 1993 | -2.85 | 94 |
| 1992 | 40.64 | 3 |
| 1991 | -79.52 | 127 |
| 1990 | 157.43 | 1 |
| 1989 | -8.37 | 105 |
| 1988 | -7.1 | 106 |
| 1987 | 32.77 | 3 |
| 1986 | 3.71 | 61 |