Year	current US$
1960	574.5805561939784
1961	670.3848554246337
1962	866.8396517254291
1963	1779.1026282691976
1964	1120.3235514364108
1965	1780.2325823123176
1966	1709.3693791912735
1967	1886.1939657979945
1968	2864.9425141199326
1969	4633.23961116877
1970	4751.059708834566
1971	4722.049678298892
1972	4494.108333422836
1973	4655.172457098879
1974	5050.654061006166
1975	5326.478605740697
1976	5743.507514897352
1977	5761.2729143042325
1978	6249.845565300297
1979	6770.3406189490115
1980	6196.559324910463
1981	6848.055134465532
1982	7146.200218037311
1983	5230.1320860495425
1984	6446.145666523021
1985	4961.767601745857
1986	6544.459729789165
1987	4760.167478850474
1988	3591.468033172105
1989	3461.6978128611613
1990	1302.8623998068267
1991	580.9283148926007
1992	153.5488669066988
1993	1855.1346656428257
1994	48.1372949417388
1995	-14.368700619477206
1996	-29.41893028373508
1997	11.34551190647046
1998	2.919665449850834
1999	1.5740388173431668