| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.83 | 80 |
| 2015 | 0.9 | 79 |
| 2014 | 0.95 | 78 |
| 2013 | 1.02 | 73 |
| 2012 | 1.08 | 72 |
| 2011 | 1.12 | 68 |
| 2010 | 1.17 | 69 |
| 2009 | 1.21 | 72 |
| 2008 | 1.25 | 73 |
| 2007 | 1.29 | 69 |
| 2006 | 1.32 | 71 |
| 2005 | 1.36 | 67 |
| 2004 | 1.39 | 62 |
| 2003 | 1.43 | 61 |
| 2002 | 0.67 | 100 |
| 2001 | -.86 | 177 |
| 2000 | -.84 | 176 |
| 1999 | -.78 | 176 |
| 1998 | -.74 | 173 |
| 1997 | -.68 | 169 |
| 1996 | -.63 | 167 |
| 1995 | -.56 | 165 |
| 1994 | -.51 | 163 |
| 1993 | -.43 | 163 |
| 1992 | -.37 | 166 |
| 1991 | -.35 | 160 |
| 1990 | -.42 | 158 |
| 1989 | -.33 | 155 |
| 1988 | -.26 | 146 |
| 1987 | -.2 | 145 |
| 1986 | -.17 | 148 |