| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 9.91 | 68 |
| 2014 | 14.1 | 43 |
| 2013 | -9.37 | 154 |
| 2012 | 2.05 | 138 |
| 2011 | -5.94 | 154 |
| 2010 | 7.88 | 112 |
| 2009 | 4.53 | 122 |
| 2008 | 7 | 132 |
| 2007 | 17.17 | 89 |
| 2006 | 11.48 | 129 |
| 2005 | 14.42 | 84 |
| 2004 | 2.73 | 152 |
| 2003 | -2.17 | 156 |
| 2002 | 4.24 | 133 |
| 2001 | 3.57 | 144 |
| 2000 | -5.17 | 156 |
| 1999 | -.89 | 149 |
| 1998 | 3.33 | 121 |
| 1997 | 6.82 | 124 |
| 1996 | 8.14 | 111 |
| 1995 | 6.21 | 120 |
| 1994 | -9.95 | 146 |
| 1993 | 19.71 | 62 |
| 1992 | -.74 | 122 |
| 1991 | 3.93 | 104 |
| 1990 | 6.53 | 94 |
| 1989 | 1.32 | 118 |
| 1988 | 5.53 | 102 |
| 1987 | 6.51 | 92 |
| 1986 | 9.42 | 81 |