| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.37 | 51 |
| 2015 | 4.56 | 48 |
| 2014 | 6.04 | 39 |
| 2013 | 5.51 | 55 |
| 2012 | 6.11 | 52 |
| 2011 | 5.8 | 72 |
| 2010 | 2.81 | 106 |
| 2009 | 1.18 | 127 |
| 2008 | 8.6 | 95 |
| 2007 | 5.57 | 82 |
| 2006 | 5.16 | 81 |
| 2005 | 4.39 | 86 |
| 2004 | 0.99 | 145 |
| 2003 | -1.56 | 168 |
| 2002 | -2.64 | 168 |
| 2001 | -1.99 | 167 |
| 2000 | -1.61 | 161 |
| 1999 | -3.2 | 161 |
| 1998 | 0.17 | 149 |
| 1997 | 3.49 | 105 |
| 1996 | 4.82 | 101 |
| 1995 | 8.56 | 88 |
| 1994 | 6.25 | 100 |
| 1993 | 6.71 | 79 |
| 1992 | 7.71 | 72 |
| 1991 | 9.57 | 66 |
| 1990 | 7.97 | 71 |
| 1989 | 8.77 | 61 |