| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.71 | 40 |
| 2015 | 1.67 | 42 |
| 2014 | 1.65 | 44 |
| 2013 | 1.73 | 42 |
| 2012 | 1.98 | 35 |
| 2011 | 2.34 | 25 |
| 2010 | 2.83 | 16 |
| 2009 | 3.31 | 9 |
| 2008 | 3.53 | 8 |
| 2007 | 3.33 | 9 |
| 2006 | 2.81 | 16 |
| 2005 | 2 | 42 |
| 2004 | 1.28 | 69 |
| 2003 | 1.1 | 79 |
| 2002 | 1.75 | 51 |
| 2001 | 3.01 | 12 |
| 2000 | 4.73 | 2 |
| 1999 | 6.34 | 1 |
| 1998 | 7.24 | 1 |
| 1997 | 6.76 | 1 |
| 1996 | 10.92 | 1 |
| 1995 | 8.72 | 1 |
| 1994 | 6.75 | 1 |
| 1993 | 5.36 | 6 |
| 1992 | 5.02 | 6 |
| 1991 | -7.74 | 204 |
| 1990 | -7.31 | 202 |
| 1989 | -6.96 | 201 |
| 1988 | -6.33 | 201 |
| 1987 | -5.35 | 199 |
| 1986 | -4.16 | 195 |