| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.2 | 126 |
| 2015 | 1.1 | 150 |
| 2014 | 0.86 | 158 |
| 2013 | 0.68 | 167 |
| 2012 | 0.66 | 167 |
| 2011 | 0.58 | 167 |
| 2010 | 0.73 | 165 |
| 2009 | 0.91 | 160 |
| 2008 | 0.64 | 167 |
| 2007 | 0.69 | 167 |
| 2006 | 0.71 | 166 |
| 2005 | 0.95 | 160 |
| 2004 | 1.13 | 161 |
| 2003 | 1.22 | 158 |
| 2002 | 1.09 | 159 |
| 2001 | 1.13 | 160 |
| 2000 | 1.02 | 161 |
| 1999 | 1.23 | 152 |
| 1998 | 1.41 | 152 |
| 1997 | 1.23 | 157 |
| 1996 | 1.12 | 156 |
| 1995 | 1.16 | 155 |
| 1994 | 1.2 | 139 |
| 1993 | 1.08 | 135 |
| 1992 | 0.97 | 133 |
| 1991 | 1.02 | 130 |
| 1990 | 0.97 | 128 |
| 1989 | 0.96 | 113 |
| 1988 | 2.22 | 105 |
| 1987 | 1.93 | 108 |
| 1986 | 1.93 | 104 |