Year	% of GDP
1970	25.820934873517672
1971	24.45638289293413
1972	23.08821514237424
1973	25.21384951843027
1974	23.176997507900584
1975	29.782972653619982
1976	32.10629908118223
1977	31.96641323058451
1978	36.53441965349148
1979	28.57212517589012
1980	22.80246202434196
1981	20.921629512108442
1982	18.22398854148708
1983	15.930251924600238
1984	16.798205522890743
1985	16.916237204423552
1986	20.56761123029206
1987	17.856039460033525
1988	13.819741683066585
1989	17.080085587591533
1990	18.76574357900156
1991	19.70396739959079
1992	19.818221697801533
1993	18.293310751894737
1994	20.54307747098976
1995	21.867778601261303
1996	18.108949544597493
1997	15.700310006851115
1998	18.26179038879039