| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.71 | 27 |
| 2015 | 3.7 | 35 |
| 2014 | 3.7 | 43 |
| 2013 | 3.98 | 44 |
| 2012 | 1.91 | 85 |
| 2011 | 4.57 | 58 |
| 2010 | 3.05 | 89 |
| 2009 | 2.1 | 39 |
| 2008 | 2.29 | 100 |
| 2007 | 5.14 | 77 |
| 2006 | 1.51 | 160 |
| 2005 | 4.99 | 56 |
| 2004 | 4.73 | 71 |
| 2003 | 3.89 | 68 |
| 2002 | 4.24 | 45 |
| 2001 | 3.17 | 56 |
| 2000 | 2.22 | 123 |
| 1999 | 2.2 | 87 |
| 1998 | 1.11 | 123 |
| 1997 | 0.84 | 142 |
| 1996 | 1.66 | 117 |
| 1995 | 0.5 | 135 |
| 1994 | -1.64 | 147 |
| 1993 | -2.13 | 136 |
| 1992 | -2.75 | 133 |
| 1991 | -1.24 | 113 |
| 1990 | 3.69 | 45 |
| 1989 | 0.61 | 105 |