| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.03 | 128 |
| 2015 | 0.03 | 128 |
| 2014 | 0.03 | 128 |
| 2013 | -.35 | 146 |
| 2012 | 0.04 | 128 |
| 2011 | -.35 | 150 |
| 2010 | 0.06 | 127 |
| 2009 | -.71 | 164 |
| 2008 | -.26 | 146 |
| 2007 | -.64 | 161 |
| 2006 | -.17 | 144 |
| 2005 | -.42 | 155 |
| 2004 | 0.27 | 126 |
| 2003 | 0.53 | 112 |
| 2002 | 0.86 | 90 |
| 2001 | 0.87 | 89 |
| 2000 | 0.88 | 84 |
| 1999 | 0.88 | 88 |
| 1998 | 0.89 | 88 |
| 1997 | 0.93 | 88 |
| 1996 | 1.64 | 64 |
| 1995 | 1.98 | 51 |
| 1994 | 2.39 | 36 |
| 1993 | 2.3 | 42 |
| 1992 | 2.22 | 46 |
| 1991 | 2.3 | 41 |
| 1990 | 2.1 | 49 |
| 1989 | 1.62 | 76 |
| 1988 | 1.57 | 72 |
| 1987 | 1.62 | 72 |
| 1986 | 1.49 | 76 |