| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 5.54 | 140 |
| 2014 | 6.31 | 147 |
| 2013 | 6.38 | 160 |
| 2012 | 6.2 | 162 |
| 2011 | 6 | 165 |
| 2010 | 5.93 | 165 |
| 2009 | 5.26 | 169 |
| 2008 | 6.5 | 162 |
| 2007 | 6.33 | 165 |
| 2006 | 5.84 | 166 |
| 2005 | 5.4 | 165 |
| 2004 | 4.75 | 156 |
| 2003 | 4.71 | 152 |
| 2002 | 4.21 | 153 |
| 2001 | 4.24 | 147 |
| 2000 | 4.62 | 142 |
| 1999 | 4.27 | 140 |
| 1998 | 3.93 | 142 |
| 1997 | 4.09 | 141 |
| 1996 | 3.86 | 140 |
| 1995 | 5.88 | 132 |
| 1994 | 4.78 | 129 |
| 1993 | 4.41 | 128 |
| 1992 | 4.01 | 124 |
| 1991 | 3.64 | 123 |
| 1990 | 3.46 | 121 |
| 1989 | 3.69 | 117 |
| 1988 | 3.35 | 115 |
| 1987 | 3.05 | 115 |
| 1986 | 3.3 | 113 |