| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.3 | 131 |
| 2015 | 0.406 | 142 |
| 2014 | 0.415 | 150 |
| 2013 | 0.542 | 148 |
| 2012 | 0.478 | 151 |
| 2011 | 0.462 | 153 |
| 2010 | 0.5 | 156 |
| 2009 | 0.435 | 158 |
| 2008 | 0.589 | 162 |
| 2007 | 0.808 | 162 |
| 2006 | 0.683 | 163 |
| 2005 | 0.271 | 166 |
| 2004 | 0.08 | 157 |
| 2003 | 0.043 | 155 |
| 2002 | 0.036 | 151 |
| 2001 | 0.057 | 148 |
| 2000 | 0.07 | 147 |
| 1999 | 0.117 | 149 |
| 1998 | 0.266 | 148 |
| 1997 | 0.301 | 145 |
| 1996 | 0.301 | 140 |
| 1995 | 0.902 | 136 |
| 1994 | 1.698 | 128 |
| 1993 | 2.144 | 124 |
| 1992 | 3.351 | 113 |
| 1991 | 5.073 | 98 |
| 1990 | 4.08 | 106 |
| 1989 | 2.32 | 110 |
| 1988 | 1.76 | 109 |
| 1987 | 1.76 | 106 |
| 1986 | 1.76 | 106 |