| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.19 | 134 |
| 2015 | 0.167 | 149 |
| 2014 | 0.144 | 155 |
| 2013 | 0.14 | 155 |
| 2012 | 0.136 | 157 |
| 2011 | 0.168 | 156 |
| 2010 | 0.206 | 159 |
| 2009 | 0.293 | 160 |
| 2008 | 0.419 | 164 |
| 2007 | 0.529 | 165 |
| 2006 | 0.57 | 164 |
| 2005 | 0.441 | 165 |
| 2004 | 0.403 | 155 |
| 2003 | 0.503 | 151 |
| 2002 | 0.869 | 145 |
| 2001 | 1.52 | 143 |
| 2000 | 1.712 | 142 |
| 1999 | 1.683 | 143 |
| 1998 | 4.604 | 116 |
| 1997 | 3.472 | 132 |
| 1996 | 3.41 | 130 |
| 1995 | 3.504 | 131 |
| 1994 | 3.002 | 126 |
| 1993 | 2.301 | 121 |
| 1992 | 2.869 | 117 |
| 1991 | 4.63 | 100 |
| 1990 | 4.672 | 102 |
| 1989 | 3.213 | 108 |
| 1988 | 2.738 | 107 |
| 1987 | 2.886 | 105 |
| 1986 | 3.911 | 101 |