| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.802 | 82 |
| 2015 | 6.92 | 94 |
| 2014 | 5.694 | 113 |
| 2013 | 9.247 | 81 |
| 2012 | 9.481 | 82 |
| 2011 | 9.684 | 80 |
| 2010 | 10.377 | 73 |
| 2009 | 11.554 | 72 |
| 2008 | 10.069 | 87 |
| 2007 | 9.331 | 98 |
| 2006 | 9.933 | 90 |
| 2005 | 11.191 | 78 |
| 2004 | 11.745 | 73 |
| 2003 | 11.577 | 84 |
| 2002 | 12.84 | 78 |
| 2001 | 9.549 | 106 |
| 2000 | 12.073 | 88 |
| 1999 | 14.944 | 77 |
| 1998 | 15.753 | 75 |
| 1997 | 15.468 | 73 |
| 1996 | 22.515 | 43 |
| 1995 | 20.243 | 44 |
| 1994 | 22.911 | 37 |
| 1993 | 1443.608 | 1 |
| 1992 | 1157.785 | 1 |