| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.12 | 51 |
| 2015 | 3.43 | 82 |
| 2014 | -.18 | 176 |
| 2013 | 2.22 | 127 |
| 2012 | 6.28 | 38 |
| 2011 | 12.41 | 8 |
| 2010 | 8.1 | 29 |
| 2009 | 8.66 | 11 |
| 2008 | 6.08 | 63 |
| 2007 | 6.59 | 79 |
| 2006 | -3.9 | 200 |
| 2005 | 10.8 | 15 |
| 2004 | 10.34 | 18 |
| 2003 | 14.02 | 6 |
| 2002 | -12.49 | 198 |
| 2001 | -9.31 | 198 |
| 2000 | -8.56 | 197 |
| 1999 | 8.28 | 20 |
| 1998 | 14.33 | 6 |
| 1997 | 14.67 | 5 |
| 1996 | 1.22 | 167 |
| 1995 | 7.12 | 31 |