| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.484 | 126 |
| 2015 | 3.449 | 138 |
| 2014 | 3.587 | 144 |
| 2013 | 4.195 | 145 |
| 2012 | 5.227 | 128 |
| 2011 | 5.922 | 118 |
| 2010 | 5.251 | 140 |
| 2009 | 4.376 | 148 |
| 2008 | 5.744 | 137 |
| 2007 | 6.914 | 133 |
| 2006 | 7.763 | 118 |
| 2005 | 7.55 | 114 |
| 2004 | 7.111 | 120 |
| 2003 | 8.461 | 104 |
| 2002 | 11.833 | 87 |
| 2001 | 8.569 | 115 |
| 2000 | 11.499 | 97 |
| 1999 | 15.291 | 73 |
| 1998 | 17.574 | 65 |
| 1997 | 18.076 | 60 |
| 1996 | 20.534 | 56 |
| 1995 | 19.946 | 47 |