| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.98 | 41 |
| 2015 | 0.57 | 109 |
| 2014 | 2.09 | 104 |
| 2013 | 7.42 | 32 |
| 2012 | 4.35 | 55 |
| 2011 | 4.66 | 67 |
| 2010 | 3.19 | 66 |
| 2009 | 3.23 | 74 |
| 2008 | 3.6 | 84 |
| 2007 | 2.8 | 86 |
| 2006 | 3.91 | 73 |
| 2005 | 1.34 | 99 |
| 2004 | 3.21 | 91 |
| 2003 | 3.53 | 65 |
| 2002 | 4.21 | 55 |
| 2001 | 5.93 | 46 |
| 2000 | 2.95 | 74 |
| 1999 | 6.61 | 40 |
| 1998 | 4.63 | 46 |
| 1997 | 6.48 | 26 |
| 1996 | 4.32 | 63 |
| 1995 | 3.05 | 72 |
| 1994 | 4.36 | 41 |
| 1993 | 4.22 | 38 |
| 1992 | 3.94 | 51 |
| 1991 | 3.56 | 44 |
| 1990 | 3.39 | 54 |
| 1989 | 5.34 | 36 |
| 1988 | -5.68 | 102 |
| 1987 | 13.8 | 13 |