| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.382 | 123 |
| 2015 | 0.503 | 137 |
| 2014 | 0.507 | 149 |
| 2013 | 0.417 | 151 |
| 2012 | 0.674 | 146 |
| 2011 | 1.268 | 140 |
| 2010 | 1.106 | 144 |
| 2009 | 4.819 | 77 |
| 2008 | 5.718 | 75 |
| 2007 | 4.372 | 96 |
| 2006 | 2.844 | 129 |
| 2005 | 2.133 | 133 |
| 2004 | 2.161 | 123 |
| 2003 | 2.397 | 122 |
| 2002 | 2.743 | 121 |
| 2001 | 4.034 | 112 |
| 2000 | 3.761 | 119 |
| 1999 | 4.188 | 123 |
| 1998 | 8.073 | 78 |
| 1997 | 6.194 | 92 |
| 1996 | 6.053 | 98 |
| 1995 | 8.739 | 70 |
| 1994 | 11.505 | 44 |