| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5 | 92 |
| 2015 | 8.8 | 77 |
| 2014 | 13.24 | 48 |
| 2013 | 11.45 | 70 |
| 2012 | -.06 | 143 |
| 2011 | 10.13 | 85 |
| 2010 | 13.81 | 69 |
| 2009 | 8.23 | 92 |
| 2008 | 13.95 | 88 |
| 2007 | 14.87 | 107 |
| 2006 | 8.13 | 142 |
| 2005 | 5.65 | 144 |
| 2004 | 7.45 | 123 |
| 2003 | 1.95 | 143 |
| 2002 | 21.17 | 43 |
| 2001 | 1.37 | 145 |
| 2000 | 19.13 | 52 |
| 1999 | 13.3 | 83 |
| 1998 | 7.77 | 101 |
| 1997 | 18.58 | 69 |
| 1996 | -10.1 | 155 |
| 1995 | -6.15 | 147 |
| 1994 | 26.54 | 59 |
| 1993 | -9.23 | 133 |
| 1992 | -16.72 | 132 |
| 1991 | 1.48 | 116 |
| 1990 | -.71 | 113 |
| 1989 | 2.45 | 116 |
| 1988 | 2.04 | 110 |
| 1987 | -18.33 | 125 |
| 1986 | -4.27 | 117 |