| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.52 | 173 |
| 2015 | 0.52 | 171 |
| 2014 | 0.52 | 165 |
| 2013 | 0.52 | 164 |
| 2012 | 0.53 | 164 |
| 2011 | 0.54 | 163 |
| 2010 | 0.56 | 166 |
| 2009 | 0.58 | 165 |
| 2008 | 0.56 | 171 |
| 2007 | 0.5 | 172 |
| 2006 | 0.41 | 173 |
| 2005 | 0.3 | 178 |
| 2004 | 0.22 | 179 |
| 2003 | 0.22 | 178 |
| 2002 | 0.31 | 177 |
| 2001 | 0.47 | 172 |
| 2000 | 0.67 | 160 |
| 1999 | 0.84 | 149 |
| 1998 | 0.98 | 142 |
| 1997 | 1.05 | 147 |
| 1996 | 1.04 | 146 |
| 1995 | 1.05 | 144 |
| 1994 | 1.07 | 145 |
| 1993 | 1.08 | 149 |
| 1992 | 1.09 | 147 |
| 1991 | 1.08 | 153 |
| 1990 | 1.06 | 155 |
| 1989 | 1.04 | 160 |
| 1988 | 1.03 | 165 |
| 1987 | 1.04 | 171 |
| 1986 | 1.05 | 169 |