Year	% of GDP
1960	33.05122692954352
1961	34.393517317886946
1962	34.69751881462172
1963	33.60732897263471
1964	31.545307635829857
1965	31.301925176901904
1966	30.740311309129805
1967	34.8294619472147
1968	35.359893354533156
1969	36.755909096018094
1972	36.308385915565715
1973	33.70884900911404
1974	32.51902497679404