| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.368 | 127 |
| 2015 | 3.533 | 137 |
| 2014 | 4.263 | 142 |
| 2013 | 4.643 | 141 |
| 2012 | 5.396 | 124 |
| 2011 | 5.758 | 121 |
| 2010 | 5.512 | 123 |
| 2009 | 5.649 | 127 |
| 2008 | 7.168 | 121 |
| 2007 | 6.552 | 138 |
| 2006 | 5.988 | 138 |
| 2005 | 5.593 | 137 |
| 2004 | 5.904 | 134 |
| 2003 | 6.237 | 126 |
| 2002 | 6.769 | 128 |
| 2001 | 7.708 | 123 |
| 2000 | 8.545 | 121 |
| 1999 | 9.396 | 115 |
| 1998 | 15.279 | 76 |
| 1997 | 11.877 | 94 |
| 1996 | 8.84 | 117 |
| 1995 | 9 | 114 |
| 1994 | 8.5 | 111 |
| 1993 | 8.583 | 107 |
| 1992 | 10 | 89 |
| 1991 | 10 | 85 |
| 1990 | 10 | 85 |
| 1989 | 11.25 | 72 |
| 1988 | 10.125 | 72 |
| 1987 | 10 | 73 |
| 1986 | 10 | 72 |