| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 14.84 | 97 |
| 2014 | 14.04 | 110 |
| 2013 | 15.44 | 107 |
| 2012 | 15.66 | 107 |
| 2011 | 15.66 | 103 |
| 2010 | 17.32 | 93 |
| 2009 | 15.09 | 106 |
| 2008 | 15.83 | 103 |
| 2007 | 16.31 | 101 |
| 2006 | 13.03 | 125 |
| 2005 | 14.13 | 111 |
| 2004 | 17.06 | 86 |
| 2003 | 16.76 | 84 |
| 2002 | 20.63 | 64 |
| 2001 | 19.02 | 66 |
| 2000 | 19.41 | 60 |
| 1999 | 24.73 | 40 |
| 1998 | 23.9 | 43 |
| 1997 | 20.97 | 55 |
| 1996 | 21.51 | 46 |
| 1995 | 20.25 | 55 |