| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.346 | 127 |
| 2015 | 0.35 | 146 |
| 2014 | 0.316 | 152 |
| 2013 | 0.495 | 150 |
| 2012 | 0.638 | 148 |
| 2011 | 1.029 | 144 |
| 2010 | 0.597 | 155 |
| 2009 | 0.767 | 156 |
| 2008 | 3.926 | 105 |
| 2007 | 3.583 | 123 |
| 2006 | 2.556 | 137 |
| 2005 | 1.862 | 145 |
| 2004 | 1.775 | 133 |
| 2003 | 2.032 | 129 |
| 1998 | 3.313 | 133 |
| 1997 | 3.458 | 133 |
| 1996 | 3.542 | 128 |
| 1995 | 5 | 110 |
| 1994 | 5 | 95 |
| 1993 | 5.333 | 92 |
| 1992 | 6 | 87 |
| 1991 | 6 | 89 |
| 1990 | 6 | 92 |
| 1989 | 5.042 | 96 |
| 1988 | 4.458 | 96 |
| 1987 | 4.938 | 90 |
| 1986 | 5.5 | 90 |