Year	% of GDP
1961	0.23082542001460898
1962	0.254470426409904
1963	0.290155440414508
1964	0.33048780487804896
1965	0.296955772544515
1966	0.353645266594124
1967	0.38794435857805304
1968	0.4072265625
1969	0.41958041958042
1970	0.49601417183348107
1971	0.48305084745762694
1972	0.45360824742267997
1973	0.5054945054945059
1974	0.72714916751614
1975	0.516201117318436
1976	0.517512790240063
1977	0.46075581395348797
1978	0.9949883877276621
1979	0.97466103578573
1980	0.549735206078747
1981	0.607709750566893
1982	0.28826662085552296
1983	0.239324528624811
1984	0.143127627483072
1985	0.050709706959707
1986	28.9482415394824
1987	16.9562113279391
1988	17.435716801690702
1989	1.5299921355544401