| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.686 | 28 |
| 2015 | 5.425 | 38 |
| 2014 | 6.625 | 31 |
| 2013 | 5.939 | 50 |
| 2012 | 6.717 | 42 |
| 2011 | 7.115 | 38 |
| 2010 | 7.211 | 45 |
| 2009 | 2.456 | 71 |
| 2008 | 8.639 | 31 |
| 2007 | 18.655 | 8 |
| 2006 | 6.896 | 69 |
| 2005 | 8.568 | 38 |
| 2004 | 7.148 | 53 |
| 2003 | 3.962 | 87 |
| 2002 | 7.472 | 23 |
| 2001 | 4.389 | 71 |
| 2000 | 7.493 | 30 |
| 1999 | 5.523 | 40 |
| 1998 | -6.454 | 154 |
| 1997 | 10.222 | 16 |
| 1996 | 9.304 | 13 |
| 1995 | 7.243 | 24 |
| 1994 | 13.29 | 7 |
| 1993 | 20.002 | 4 |
| 1992 | 12.883 | 3 |
| 1991 | 14.903 | 2 |
| 1990 | 18.539 | 5 |
| 1989 | 25.384 | 1 |
| 1988 | 13.464 | 4 |
| 1987 | 6.505 | 31 |
| 1986 | -7.481 | 107 |