| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2014 | 66.64 | 148 |
| 2013 | 63.92 | 150 |
| 2012 | 54.56 | 153 |
| 2011 | 57.4 | 153 |
| 2010 | 50.82 | 153 |
| 2009 | 45.05 | 157 |
| 2008 | 50.81 | 152 |
| 2007 | 46.01 | 148 |
| 2006 | 40 | 149 |
| 2005 | 36.59 | 148 |
| 2004 | 34.54 | 150 |
| 2003 | 30.71 | 145 |
| 2002 | 26.89 | 146 |
| 2001 | 24.92 | 142 |
| 2000 | 24.84 | 144 |
| 1999 | 26.64 | 141 |
| 1998 | 24.8 | 141 |
| 1997 | 22.98 | 142 |
| 1996 | 25.04 | 139 |
| 1995 | 24.28 | 135 |
| 1994 | 19.48 | 131 |
| 1993 | 16.73 | 137 |
| 1992 | 16.31 | 139 |
| 1991 | 14.84 | 141 |
| 1990 | 14.21 | 142 |
| 1989 | 11.2 | 129 |
| 1988 | 11.62 | 128 |
| 1987 | 10.53 | 129 |
| 1986 | 7.79 | 129 |