Year	current US$
1960	21.537897479970077
1961	39.713333855314374
1962	19.326711634345678
1963	-0.4386734416776005
1964	21.844347901797104
1965	44.33291270512505
1966	73.12987546893123
1967	108.595840963398
1968	35.1425215212082
1969	52.748260654064296
1970	99.30673019926662
1971	141.12083687032398
1972	153.35065904990154
1973	226.79439727120982
1974	238.30951026167537
1975	108.31873490114647
1976	104.75108471286556
1977	157.03849416893604
1978	123.92487173564227
1979	228.17807707765564
1980	388.0420275120171
1981	257.4690334950536
1982	108.09686746211689
1983	117.48397521761116
1984	380.71418779168397
1985	1008.5792033303306
1986	730.372542441037
1987	514.9971851873479
1988	578.2143047877714
1989	16.252527740503865
1990	20.50005499813984
1991	95.22750604871796
1992	116.53368361121433
1993	-0.36875874977810236
1994	20.89289615304754
1995	7.66087820821133
1996	-8.73012966554807
1997	13.423305934130461
1998	7.9606310177995
1999	1.0832279952860697