| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.35 | 116 |
| 2015 | 4.35 | 130 |
| 2014 | 5.6 | 114 |
| 2013 | 6 | 111 |
| 2012 | 6 | 115 |
| 2011 | 6.56 | 110 |
| 2010 | 5.81 | 122 |
| 2009 | 5.31 | 132 |
| 2008 | 5.31 | 142 |
| 2007 | 7.47 | 127 |
| 2006 | 6.12 | 137 |
| 2005 | 5.58 | 138 |
| 2004 | 5.58 | 138 |
| 2003 | 5.31 | 142 |
| 2002 | 5.31 | 142 |
| 2001 | 5.85 | 137 |
| 2000 | 5.85 | 140 |
| 1999 | 5.85 | 139 |
| 1998 | 6.39 | 138 |
| 1997 | 8.64 | 120 |
| 1996 | 10.08 | 108 |
| 1995 | 12.06 | 90 |
| 1994 | 10.98 | 86 |
| 1993 | 10.98 | 87 |
| 1992 | 8.64 | 98 |
| 1991 | 8.64 | 98 |
| 1990 | 9.36 | 90 |
| 1989 | 11.34 | 71 |
| 1988 | 9 | 84 |
| 1987 | 7.92 | 95 |
| 1986 | 7.92 | 95 |