| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.443 | 83 |
| 2015 | 2.892 | 93 |
| 2014 | 3.274 | 93 |
| 2013 | 2.859 | 103 |
| 2012 | 2.736 | 118 |
| 2011 | 3.093 | 110 |
| 2010 | 4.419 | 88 |
| 2009 | 1.463 | 86 |
| 2008 | 3.227 | 110 |
| 2007 | 5.161 | 111 |
| 2006 | 4.555 | 111 |
| 2005 | 3.97 | 111 |
| 2004 | 2.973 | 127 |
| 2003 | 2.093 | 121 |
| 2002 | 8.055 | 19 |
| 2001 | 5.095 | 55 |
| 2000 | 6.178 | 42 |
| 1999 | 6.571 | 29 |
| 1998 | -3.941 | 151 |
| 1997 | 5.065 | 65 |
| 1996 | 6.191 | 38 |
| 1995 | 8.078 | 20 |
| 1994 | 7.662 | 21 |
| 1993 | 6.777 | 29 |
| 1992 | 7.102 | 23 |
| 1991 | 8.566 | 13 |
| 1990 | 7.821 | 20 |
| 1989 | 7.467 | 19 |
| 1988 | 10.283 | 14 |
| 1987 | 10.135 | 15 |
| 1986 | 8.953 | 16 |