| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 35.81 | 103 |
| 2015 | 33.25 | 126 |
| 2014 | 31.09 | 126 |
| 2013 | 34.03 | 117 |
| 2012 | 31.73 | 117 |
| 2011 | 27.81 | 129 |
| 2010 | 31.41 | 125 |
| 2009 | 28.4 | 128 |
| 2008 | 24.87 | 132 |
| 2007 | 30.58 | 119 |
| 2006 | 28.16 | 119 |
| 2005 | 21.15 | 133 |
| 2004 | 20.58 | 133 |
| 2003 | 17.53 | 140 |
| 2002 | 14.63 | 147 |
| 2001 | 11.14 | 157 |
| 2000 | 11.32 | 154 |
| 1999 | 13.58 | 145 |
| 1998 | 14.49 | 142 |
| 1997 | 13.73 | 141 |
| 1996 | 13.63 | 139 |
| 1995 | 17.2 | 127 |