| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.3 | 130 |
| 2015 | 1.19 | 133 |
| 2014 | 1.08 | 134 |
| 2013 | 1.09 | 132 |
| 2012 | 0.93 | 135 |
| 2011 | 0.6 | 160 |
| 2010 | 0.68 | 158 |
| 2009 | 0.96 | 144 |
| 2008 | 0.87 | 153 |
| 2007 | 0.58 | 169 |
| 2006 | 0.61 | 166 |
| 2005 | 0.89 | 150 |
| 2004 | 0.94 | 150 |
| 2003 | 0.93 | 148 |
| 2002 | 1.03 | 143 |
| 2001 | 1.05 | 144 |
| 2000 | 0.95 | 147 |
| 1999 | 0.91 | 144 |
| 1998 | 0.98 | 141 |
| 1997 | 1.1 | 142 |
| 1996 | 0.91 | 148 |
| 1995 | 0.82 | 154 |
| 1994 | 1.06 | 146 |
| 1993 | 1.12 | 146 |
| 1992 | 1.16 | 144 |
| 1991 | 2.82 | 94 |
| 1990 | 1.11 | 153 |
| 1989 | 1.1 | 158 |
| 1988 | 0.95 | 171 |
| 1987 | 0.82 | 175 |
| 1986 | 1.76 | 141 |