Year	current US$
1984	12200000
1985	4900000
1990	1637200000
1991	415700000
1992	48000000
1995	1700000000
1996	210000000
1998	27400000
1999	63730000
2001	455000000
2003	45000000
2004	439000000
2017	3356000000