| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 30 | 113 |
| 2015 | 28 | 118 |
| 2014 | 27 | 127 |
| 2013 | 23 | 133 |
| 2012 | 23 | 131 |
| 2011 | 22 | 132 |
| 2010 | 17 | 131 |
| 2009 | 11 | 140 |
| 2008 | 11 | 144 |
| 2007 | 9 | 145 |
| 2006 | 9 | 143 |
| 2005 | 6 | 150 |
| 2004 | 4 | 159 |
| 2003 | 3 | 155 |
| 2002 | 3 | 153 |
| 2001 | 3 | 148 |
| 2000 | 3 | 148 |
| 1999 | 3 | 150 |
| 1998 | 4 | 146 |
| 1997 | 4 | 146 |
| 1996 | 3 | 146 |
| 1995 | 3 | 144 |
| 1994 | 3 | 143 |
| 1993 | 2 | 131 |
| 1992 | 1 | 141 |
| 1991 | 1 | 141 |
| 1990 | 1 | 144 |
| 1989 | 1 | 146 |
| 1988 | 1 | 145 |
| 1987 | 1 | 141 |
| 1986 | 1 | 142 |