| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 0.95 | 105 |
| 2014 | -.26 | 161 |
| 2013 | 0.53 | 157 |
| 2012 | 3.82 | 90 |
| 2011 | 2.76 | 150 |
| 2010 | -.76 | 173 |
| 2009 | 2.61 | 97 |
| 2008 | 10.66 | 64 |
| 2007 | -.23 | 174 |
| 2006 | 2.33 | 138 |
| 2005 | 6.42 | 68 |
| 2004 | -.4 | 165 |
| 2003 | 2.03 | 118 |
| 2002 | 2.18 | 111 |
| 2001 | 5.01 | 69 |
| 2000 | -.3 | 150 |
| 1999 | -1.07 | 149 |
| 1998 | 5.08 | 83 |
| 1997 | 2.32 | 123 |
| 1996 | 6.1 | 89 |
| 1995 | 7.46 | 97 |
| 1994 | 25.18 | 48 |
| 1993 | 0.55 | 140 |
| 1992 | -1.99 | 136 |
| 1991 | 2.16 | 123 |
| 1990 | -.5 | 132 |
| 1989 | -.48 | 129 |
| 1988 | 4.26 | 88 |
| 1987 | -2.68 | 123 |
| 1986 | -2.61 | 122 |