| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.71 | 85 |
| 2015 | 0.76 | 86 |
| 2014 | 0.81 | 86 |
| 2013 | 0.86 | 82 |
| 2012 | 0.89 | 82 |
| 2011 | 0.92 | 82 |
| 2010 | 0.95 | 81 |
| 2009 | 0.96 | 83 |
| 2008 | 0.98 | 86 |
| 2007 | 1 | 81 |
| 2006 | 1.02 | 84 |
| 2005 | 1.05 | 81 |
| 2004 | 1.06 | 82 |
| 2003 | 1.09 | 80 |
| 2002 | 1.12 | 78 |
| 2001 | 1.15 | 80 |
| 2000 | 0.01 | 137 |
| 1999 | -.1 | 146 |
| 1998 | -.05 | 140 |
| 1997 | 0 | 135 |
| 1996 | 0.03 | 135 |
| 1995 | 0.06 | 134 |
| 1994 | 0.09 | 134 |
| 1993 | 0.13 | 134 |
| 1992 | 0.17 | 133 |
| 1991 | 0.22 | 138 |
| 1990 | 1.23 | 83 |
| 1989 | 1.4 | 86 |
| 1988 | 1.42 | 83 |
| 1987 | 1.46 | 85 |
| 1986 | 1.49 | 78 |