| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 6 | 147 |
| 2014 | 7 | 149 |
| 2013 | 7 | 153 |
| 2012 | 7 | 151 |
| 2011 | 7 | 152 |
| 2010 | 5 | 152 |
| 2009 | 5 | 153 |
| 2008 | 6 | 152 |
| 2007 | 5 | 154 |
| 2006 | 5 | 147 |
| 2005 | 5 | 147 |
| 2004 | 5 | 141 |
| 2003 | 4 | 139 |
| 2002 | 4 | 139 |
| 2001 | 3 | 138 |
| 2000 | 3 | 137 |
| 1999 | 4 | 133 |
| 1998 | 3 | 133 |
| 1997 | 4 | 130 |
| 1996 | 4 | 128 |
| 1995 | 4 | 130 |
| 1994 | 4 | 109 |
| 1993 | 4 | 109 |
| 1992 | 3 | 112 |
| 1991 | 3 | 114 |
| 1990 | 3 | 112 |
| 1989 | 3 | 95 |
| 1988 | 2 | 95 |
| 1987 | 2 | 92 |
| 1986 | 2 | 86 |