| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.15 | 97 |
| 2015 | -.46 | 145 |
| 2014 | -.14 | 153 |
| 2013 | 2.79 | 88 |
| 2012 | 3.93 | 87 |
| 2011 | 4.98 | 91 |
| 2010 | 2.98 | 101 |
| 2009 | -.08 | 155 |
| 2008 | 10.37 | 70 |
| 2007 | 6.6 | 67 |
| 2006 | 4.43 | 90 |
| 2005 | 4.09 | 91 |
| 2004 | 3.05 | 98 |
| 2003 | 1.34 | 133 |
| 2002 | 3.57 | 75 |
| 2001 | 5.75 | 57 |
| 2000 | 4.02 | 73 |
| 1999 | 3.3 | 82 |
| 1998 | 8.21 | 53 |
| 1997 | 10.58 | 42 |
| 1996 | 23.05 | 34 |
| 1995 | 28.78 | 34 |
| 1994 | 47.65 | 25 |
| 1993 | 89.81 | 17 |