| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.373 | 125 |
| 2015 | 0.529 | 136 |
| 2014 | 0.701 | 142 |
| 2013 | 0.862 | 141 |
| 2012 | 1.024 | 142 |
| 2011 | 1.038 | 143 |
| 2010 | 1.082 | 146 |
| 2009 | 1.265 | 148 |
| 2008 | 1.612 | 153 |
| 2007 | 1.324 | 158 |
| 2006 | 1.186 | 158 |
| 2005 | 1.174 | 156 |
| 2004 | 1.283 | 143 |
| 2003 | 1.333 | 139 |
| 2002 | 1.998 | 132 |
| 2001 | 2.873 | 131 |
| 2000 | 3.422 | 124 |
| 1999 | 4.48 | 114 |
| 1998 | 8.079 | 77 |
| 1997 | 7.715 | 79 |
| 1996 | 6.793 | 91 |
| 1995 | 6.962 | 86 |
| 1994 | 7.07 | 80 |
| 1993 | 7.033 | 80 |