| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.1 | 90 |
| 2015 | 0.95 | 117 |
| 2014 | 0.42 | 124 |
| 2013 | 0.57 | 128 |
| 2012 | 1.86 | 100 |
| 2011 | 3.65 | 99 |
| 2010 | 3.67 | 106 |
| 2009 | -11.52 | 150 |
| 2008 | -.28 | 125 |
| 2007 | 5.13 | 91 |
| 2006 | 3.92 | 108 |
| 2005 | 2.04 | 127 |
| 2004 | 3.25 | 111 |
| 2003 | 2 | 113 |
| 2002 | -.71 | 130 |
| 2001 | 2.18 | 87 |
| 2000 | 4.35 | 82 |
| 1999 | 3.14 | 84 |
| 1998 | 2.99 | 89 |
| 1997 | 1.86 | 103 |
| 1996 | 1.76 | 109 |
| 1995 | 3.49 | 75 |
| 1994 | 4.39 | 65 |
| 1993 | -.28 | 78 |
| 1992 | 0.87 | 75 |
| 1991 | 4 | 46 |
| 1990 | 6.2 | 37 |
| 1989 | 2.94 | 67 |
| 1988 | 3.48 | 63 |
| 1987 | 0.27 | 85 |
| 1986 | 2.1 | 69 |