| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.55 | 21 |
| 2015 | 10.34 | 5 |
| 2014 | 7.124 | 25 |
| 2013 | 7.352 | 30 |
| 2012 | 7.431 | 35 |
| 2011 | 7.944 | 25 |
| 2010 | 7.766 | 37 |
| 2009 | 5.389 | 39 |
| 2008 | 4.127 | 94 |
| 2007 | 8.372 | 58 |
| 2006 | 5.627 | 89 |
| 2005 | 9.63 | 25 |
| 2004 | 7.766 | 47 |
| 2003 | 7.676 | 26 |
| 2002 | 7.728 | 21 |
| 2001 | 6.505 | 30 |
| 2000 | 5.441 | 53 |
| 1999 | 4.642 | 57 |
| 1998 | 4.141 | 76 |
| 1997 | 3.119 | 100 |
| 1996 | 3.619 | 80 |
| 1995 | 2.777 | 82 |
| 1994 | 0.317 | 102 |
| 1993 | -1.305 | 107 |
| 1992 | 3.446 | 67 |
| 1991 | 2.96 | 58 |