Year	current US$
1967	209265804.27819684
1968	260480910.58627507
1969	259519977.03465778
1970	265349358.40622234
1971	301992797.04347503
1972	314756794.6170483
1973	407287150.0229078
1974	581617888.5333347
1975	669150551.7166576
1976	757184778.4742657
1977	824255286.0331181
1978	975373391.3690225
1979	1187498093.9380763
1980	1386219497.4343362
1981	1431784474.8921578
1982	1343714252.2757084
1983	1262121726.0527465
1984	1290407373.9372034
1985	1344056482.614333
1986	1808609604.7973106
1987	2348576132.923016
1988	2798207971.6669846
1989	2952027213.2908516
1990	3095977977.5127015
1991	3347066028.95485
1992	4546951602.655803
1993	4559578289.581197
1994	4642759406.768774
1995	4927411366.734446
1996	5178700189.716697
1997	5031651793.568047
1998	4778541960.971728
1999	4685830842.946571
2000	4658418554.946157