| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.78 | 51 |
| 2015 | 3.91 | 30 |
| 2014 | 3.36 | 57 |
| 2013 | 1.45 | 110 |
| 2012 | 1.61 | 99 |
| 2011 | 4.96 | 47 |
| 2010 | 3.9 | 73 |
| 2009 | 2.75 | 36 |
| 2008 | 4.24 | 63 |
| 2007 | 7.09 | 44 |
| 2006 | 6.25 | 53 |
| 2005 | 3.54 | 87 |
| 2004 | 5.2 | 61 |
| 2003 | 3.63 | 73 |
| 2002 | 2.09 | 82 |
| 2001 | 1.28 | 110 |
| 2000 | 5.66 | 37 |
| 1999 | 4.65 | 38 |
| 1998 | 4.58 | 40 |
| 1997 | 6.39 | 29 |
| 1996 | 5.98 | 33 |
| 1995 | 6.81 | 23 |
| 1994 | 5.07 | 34 |
| 1993 | 3.47 | 44 |
| 1992 | 2.2 | 61 |
| 1991 | -7.34 | 157 |