| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.709 | 89 |
| 2015 | 6.768 | 96 |
| 2014 | 8.466 | 86 |
| 2013 | 10.523 | 60 |
| 2012 | 11.329 | 60 |
| 2011 | 12.128 | 52 |
| 2010 | 14.073 | 41 |
| 2009 | 17.275 | 29 |
| 2008 | 14.988 | 43 |
| 2007 | 13.348 | 58 |
| 2006 | 13.982 | 58 |
| 2005 | 19.601 | 21 |
| 2004 | 25.613 | 14 |
| 2003 | 25.435 | 15 |
| 2002 | 35.425 | 13 |
| 2001 | 45.4 | 7 |
| 2000 | 53.85 | 5 |
| 1999 | 65.642 | 3 |
| 1998 | 55.317 | 6 |
| 1997 | 72.525 | 6 |
| 1996 | 55.133 | 12 |
| 1995 | 50.717 | 13 |
| 1994 | 90.392 | 6 |