| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.79 | 54 |
| 2015 | 2.37 | 77 |
| 2014 | 4.09 | 53 |
| 2013 | 2.54 | 72 |
| 2012 | -.33 | 124 |
| 2011 | -1.81 | 134 |
| 2010 | 3.08 | 69 |
| 2009 | 3.47 | 91 |
| 2008 | 4.41 | 69 |
| 2007 | 2.97 | 94 |
| 2006 | 5.45 | 62 |
| 2005 | 3.46 | 71 |
| 2004 | 3.81 | 68 |
| 2003 | 3.47 | 63 |
| 2002 | 2.01 | 99 |
| 2001 | 3.83 | 69 |
| 2000 | 7.91 | 23 |
| 1999 | 3.23 | 61 |
| 1998 | 2.01 | 81 |
| 1997 | 2.87 | 61 |
| 1996 | 2.66 | 66 |
| 1995 | 4.79 | 34 |
| 1994 | 1.19 | 67 |
| 1993 | 2.39 | 60 |
| 1992 | 5.86 | 28 |
| 1991 | 9.57 | 18 |