| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.03 | 60 |
| 2015 | 3.73 | 68 |
| 2014 | 4.58 | 64 |
| 2013 | 3.46 | 84 |
| 2012 | 2.61 | 84 |
| 2011 | 3.65 | 100 |
| 2010 | 1.45 | 134 |
| 2009 | -2.16 | 89 |
| 2008 | 1.41 | 111 |
| 2007 | 4.5 | 98 |
| 2006 | 5.29 | 85 |
| 2005 | 2.73 | 111 |
| 2004 | 2.17 | 128 |
| 2003 | 1.48 | 121 |
| 2002 | 4.01 | 78 |
| 2001 | 1.31 | 101 |
| 2000 | 1.92 | 120 |
| 1999 | 4.5 | 67 |
| 1998 | 5.1 | 58 |
| 1997 | 5.9 | 62 |
| 1996 | 3.08 | 89 |
| 1995 | 4.82 | 60 |
| 1994 | 3.02 | 83 |
| 1993 | 3.25 | 54 |
| 1992 | 7.16 | 36 |
| 1991 | 2.55 | 59 |
| 1990 | 1.44 | 73 |
| 1989 | 3.54 | 64 |
| 1988 | 4.23 | 57 |
| 1987 | 3.72 | 59 |
| 1986 | 2.29 | 68 |