Year	% of GDP
1960	64.44533551241159
1961	64.16365413182898
1962	64.9470589100208
1963	64.03267112816414
1964	64.51359142150966
1965	63.438452541806235
1966	61.86902001740644
1967	59.63529527034949
1968	54.62890625
1969	53.7467722467717
1970	48.86083823156847
1971	48.154912893231376
1972	50.83348271319888
1973	56.48772818658897
1974	31.241044424950932
1975	45.77144117945068
1976	47.26247816142369
1977	55.93024744186047
1978	55.02143021406728
1979	51.14077667223149
1980	64.47724860158007
1981	62.75390119695321
1982	62.94871420425269
1983	60.71052279313388
1984	65.20488807928935
1985	63.67624988887616
1986	59.51962736127832
1987	60.81670804443186
1988	65.86360603466925
1989	56.18418193808926
1990	55.79418318431251