| 时间 |
值 （亿美元） |
世界排名 |
| 2004 |
34.1 |
143 |
| 2003 |
29.9 |
143 |
| 2002 |
29.1 |
139 |
| 2001 |
26.8 |
135 |
| 2000 |
29.3 |
132 |
| 1999 |
31.2 |
133 |
| 1998 |
35.9 |
128 |
| 1997 |
49.8 |
112 |
| 1996 |
45.9 |
112 |
| 1995 |
38.3 |
118 |
| 1994 |
47.5 |
96 |
| 1993 |
41.9 |
100 |
| 1992 |
42.8 |
98 |
| 1991 |
41.6 |
100 |
| 1990 |
34.9 |
102 |
| 1989 |
39.8 |
87 |
| 1988 |
39.7 |
86 |
| 1987 |
33.5 |
86 |
| 1986 |
28.5 |
89 |