| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.38 | 49 |
| 2015 | 3.42 | 61 |
| 2014 | 3.06 | 64 |
| 2013 | 2.7 | 71 |
| 2012 | 3.56 | 67 |
| 2011 | 2.45 | 70 |
| 2010 | 3.35 | 66 |
| 2009 | 2.32 | 108 |
| 2008 | 2.03 | 112 |
| 2007 | 3.16 | 88 |
| 2006 | 0.89 | 120 |
| 2005 | -2.57 | 135 |
| 2004 | 1.39 | 102 |
| 2003 | 2.38 | 83 |
| 2002 | 2.87 | 81 |
| 2001 | 6.33 | 39 |
| 2000 | 2.45 | 74 |
| 1999 | 3.48 | 56 |
| 1998 | 1.12 | 94 |
| 1997 | 2.87 | 62 |
| 1996 | 4.07 | 47 |
| 1995 | 3.27 | 47 |
| 1994 | 3.97 | 37 |
| 1993 | 2.62 | 55 |
| 1992 | 13.5 | 11 |
| 1991 | 8.11 | 24 |
| 1990 | 5.27 | 27 |
| 1989 | 5.23 | 35 |
| 1988 | 4 | 32 |
| 1987 | 3.37 | 43 |
| 1986 | 6.32 | 28 |