| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.05 | 99 |
| 2015 | 0.6 | 108 |
| 2014 | 1.22 | 100 |
| 2013 | -.1 | 124 |
| 2012 | 0.76 | 108 |
| 2011 | -.63 | 121 |
| 2010 | 1.6 | 92 |
| 2009 | 3.03 | 94 |
| 2008 | 3.25 | 89 |
| 2007 | 1.2 | 119 |
| 2006 | 2.54 | 96 |
| 2005 | 1.21 | 109 |
| 2004 | 1.52 | 97 |
| 2003 | 0.24 | 116 |
| 2002 | 2.13 | 96 |
| 2001 | 1.9 | 101 |
| 2000 | 2.93 | 67 |
| 1999 | 3.27 | 60 |
| 1998 | 3.09 | 63 |
| 1997 | 0.51 | 99 |
| 1996 | 3.05 | 57 |
| 1995 | 2.16 | 65 |
| 1994 | 2.05 | 58 |
| 1993 | 4.26 | 42 |
| 1992 | 0.66 | 72 |
| 1991 | 1.66 | 75 |
| 1990 | -1.54 | 73 |
| 1989 | -.89 | 77 |
| 1988 | -.08 | 68 |
| 1987 | 0.62 | 65 |
| 1986 | 0.78 | 74 |