| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 16.65 | 127 |
| 2015 | 15.95 | 147 |
| 2014 | 15.66 | 148 |
| 2013 | 13.32 | 151 |
| 2012 | 12.42 | 152 |
| 2011 | 12.05 | 153 |
| 2010 | 11.47 | 157 |
| 2009 | 11.05 | 157 |
| 2008 | 10.92 | 162 |
| 2007 | 9.68 | 163 |
| 2006 | 9.77 | 163 |
| 2005 | 7.22 | 163 |
| 2004 | 8.16 | 163 |
| 2003 | 11.61 | 157 |
| 2002 | 13.25 | 152 |
| 2001 | 12.07 | 153 |
| 2000 | 12.35 | 151 |
| 1999 | 10.79 | 152 |
| 1998 | 10.25 | 150 |
| 1997 | 12.68 | 146 |
| 1996 | 14.5 | 133 |
| 1995 | 12.91 | 142 |
| 1994 | 9.57 | 141 |
| 1993 | 11.51 | 137 |
| 1992 | 13.35 | 128 |
| 1991 | 13.68 | 124 |
| 1990 | 14.8 | 119 |
| 1989 | 15.47 | 117 |
| 1988 | 14.83 | 115 |
| 1987 | 21.56 | 95 |
| 1986 | 19.66 | 99 |