| 时间 |
值 （亿美元） |
世界排名 |
| 2007 |
3 |
139 |
| 2006 |
3 |
137 |
| 2005 |
2 |
134 |
| 2004 |
2 |
128 |
| 2003 |
2 |
126 |
| 2002 |
2 |
124 |
| 2001 |
1 |
122 |
| 2000 |
1 |
123 |
| 1999 |
1 |
120 |
| 1998 |
1 |
119 |
| 1997 |
1 |
124 |
| 1996 |
1 |
130 |
| 1995 |
1 |
121 |
| 1994 |
0 |
119 |
| 1993 |
0 |
119 |
| 1992 |
1 |
109 |
| 1991 |
1 |
100 |
| 1990 |
1 |
101 |
| 1989 |
1 |
97 |
| 1988 |
1 |
95 |
| 1987 |
1 |
92 |
| 1986 |
1 |
90 |