| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | -.09 | 114 |
| 2014 | -.01 | 117 |
| 2013 | 1.03 | 95 |
| 2012 | 1.52 | 85 |
| 2011 | -.3 | 121 |
| 2010 | 0.58 | 115 |
| 2009 | 0 | 72 |
| 2008 | 0.23 | 107 |
| 2007 | 1.42 | 109 |
| 2006 | 0.85 | 120 |
| 2005 | 0.83 | 120 |
| 2004 | 1.12 | 115 |
| 2003 | -.32 | 116 |
| 2002 | -.42 | 107 |
| 2001 | 1.49 | 75 |
| 2000 | 1.2 | 84 |
| 1999 | 1.54 | 73 |
| 1998 | 1.86 | 81 |
| 1997 | 1.37 | 86 |
| 1996 | 0.64 | 98 |
| 1995 | 0.21 | 85 |
| 1994 | 0.42 | 78 |
| 1993 | -1.27 | 78 |
| 1992 | -.63 | 66 |
| 1991 | 0.56 | 60 |
| 1990 | 0.54 | 54 |
| 1989 | 1.7 | 51 |
| 1988 | 1.39 | 55 |
| 1987 | 2.35 | 38 |
| 1986 | 2.27 | 45 |