| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.027 | 60 |
| 2015 | 3.499 | 64 |
| 2014 | 4.519 | 55 |
| 2013 | 4.848 | 55 |
| 2012 | 3.772 | 77 |
| 2011 | 3.395 | 85 |
| 2010 | 3.528 | 86 |
| 2009 | 4.944 | 74 |
| 2008 | 5.461 | 77 |
| 2007 | 5.447 | 74 |
| 2006 | 4.621 | 78 |
| 2005 | 2.913 | 112 |
| 2004 | 2.492 | 114 |
| 2003 | 3.143 | 104 |
| 2002 | 4.426 | 92 |
| 2001 | 5.805 | 76 |
| 2000 | 6.968 | 76 |
| 1999 | 8.304 | 64 |
| 1998 | 8.206 | 75 |
| 1997 | 9.098 | 67 |
| 1996 | 8.503 | 75 |
| 1995 | 7.683 | 78 |
| 1994 | 7.093 | 79 |
| 1993 | 6.88 | 82 |
| 1992 | 7.2 | 79 |
| 1991 | 8.13 | 62 |
| 1990 | 8.15 | 65 |