| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 14.33 | 45 |
| 2015 | 14.38 | 55 |
| 2014 | 15.47 | 54 |
| 2013 | 14.79 | 57 |
| 2012 | 13.43 | 57 |
| 2011 | 14.76 | 54 |
| 2010 | 14.45 | 53 |
| 2009 | 10.11 | 76 |
| 2008 | 10.71 | 70 |
| 2007 | 12.01 | 67 |
| 2006 | 17.38 | 56 |
| 2005 | 19.53 | 51 |
| 2004 | 20.47 | 48 |
| 2003 | 21.52 | 46 |
| 2002 | 24.08 | 42 |
| 2001 | 25.96 | 35 |
| 2000 | 29.03 | 30 |
| 1999 | 27.87 | 32 |
| 1998 | 31.76 | 29 |
| 1997 | 30.21 | 36 |
| 1996 | 31.4 | 32 |
| 1995 | 33.02 | 31 |