| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11.616 | 8 |
| 2015 | 14.148 | 6 |
| 2014 | 10.426 | 15 |
| 2013 | 10.16 | 17 |
| 2012 | 9.569 | 26 |
| 2011 | 9.248 | 21 |
| 2010 | 8.95 | 23 |
| 2009 | 8.653 | 28 |
| 2008 | 6.628 | 62 |
| 2007 | 6.254 | 65 |
| 2006 | 5.837 | 62 |
| 2005 | 5.813 | 58 |
| 2004 | 4.896 | 66 |
| 2003 | 6.875 | 54 |
| 2002 | 9.599 | 30 |
| 2001 | 14.902 | 20 |
| 2000 | 18.078 | 13 |
| 1999 | 27.349 | 8 |
| 1998 | 24.936 | 15 |
| 1997 | 26.077 | 13 |
| 1996 | 32.192 | 13 |
| 1995 | 63.18 | 7 |