| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.45 | 8 |
| 2015 | 11.73 | 8 |
| 2014 | 9.84 | 17 |
| 2013 | 10.97 | 18 |
| 2012 | 9.34 | 19 |
| 2011 | 14.48 | 15 |
| 2010 | 13.56 | 11 |
| 2009 | -9.49 | 141 |
| 2008 | 4.04 | 78 |
| 2007 | 8.4 | 46 |
| 2006 | 18.27 | 12 |
| 2005 | 12.69 | 14 |
| 2004 | 16.6 | 10 |
| 2003 | 12.05 | 25 |
| 2002 | 17.07 | 8 |
| 2001 | 11.2 | 19 |
| 2000 | 31.19 | 4 |
| 1999 | 21.19 | 6 |
| 1998 | 6.21 | 46 |
| 1997 | 16.81 | 14 |
| 1996 | 4.39 | 72 |
| 1995 | 18.91 | 8 |
| 1994 | 14.21 | 9 |