| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.198 | 44 |
| 2015 | 3.771 | 70 |
| 2014 | 2.162 | 122 |
| 2013 | 2.312 | 120 |
| 2012 | 2.558 | 122 |
| 2011 | 2.894 | 117 |
| 2010 | 1.996 | 130 |
| 2009 | 2.929 | 65 |
| 2008 | 3.903 | 100 |
| 2007 | 6.399 | 91 |
| 2006 | 5.277 | 97 |
| 2005 | 3.169 | 123 |
| 2004 | 4.217 | 104 |
| 2003 | 2.656 | 114 |
| 2002 | 3.677 | 82 |
| 2001 | 2.04 | 117 |
| 2000 | 4.952 | 74 |
| 1999 | 5.594 | 38 |
| 1998 | 4.467 | 61 |
| 1997 | 4.761 | 74 |