| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 15 | 133 |
| 2014 | 16 | 137 |
| 2013 | 17 | 140 |
| 2012 | 18 | 134 |
| 2011 | 18 | 134 |
| 2010 | 17 | 134 |
| 2009 | 14 | 132 |
| 2008 | 13 | 136 |
| 2007 | 14 | 133 |
| 2006 | 13 | 132 |
| 2005 | 13 | 129 |
| 2004 | 11 | 131 |
| 2003 | 8 | 130 |
| 2002 | 6 | 133 |
| 2001 | 6 | 131 |
| 2000 | 7 | 126 |
| 1999 | 6 | 127 |
| 1998 | 6 | 123 |
| 1997 | 6 | 122 |
| 1996 | 6 | 119 |
| 1995 | 6 | 118 |
| 1994 | 5 | 103 |
| 1993 | 5 | 102 |
| 1992 | 5 | 100 |
| 1991 | 4 | 106 |
| 1990 | 4 | 106 |
| 1989 | 3 | 94 |
| 1988 | 2 | 93 |
| 1987 | 2 | 96 |
| 1986 | 1 | 97 |