| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.635 | 37 |
| 2015 | 4.286 | 54 |
| 2014 | 2.614 | 87 |
| 2013 | 0.683 | 145 |
| 2012 | 0.454 | 153 |
| 2011 | 0.282 | 155 |
| 2010 | 0.736 | 153 |
| 2009 | 1.132 | 151 |
| 2008 | 2.148 | 147 |
| 2007 | 5.917 | 70 |
| 2006 | 7.808 | 42 |
| 2005 | 4.615 | 75 |
| 2004 | 18.542 | 5 |
| 2003 | 24.813 | 6 |
| 2002 | 13.542 | 21 |
| 2001 | 20.208 | 10 |
| 2000 | 17.958 | 14 |
| 1999 | 11.438 | 42 |
| 1998 | 19.408 | 20 |
| 1997 | 15.917 | 31 |
| 1996 | 16.917 | 34 |
| 1995 | 11.417 | 55 |