Year	% of GDP
1973	8.631147894719177
1974	10.181310485635784
1975	7.521318802933733
1976	9.906255355129872
1977	10.901857372712962
1978	9.719924820342033
1979	11.702193982729774
1980	10.467635930984853
1989	10.826929269085797
1990	8.783806270327837
1991	9.260063960786452
1992	9.048258735628977
2014	12.947628984391867
2015	13.293895799230837
2016	14.416149845451931
2017	13.45137170505342
2018	14.249711064212347
2019	14.60535804668462
2020	15.074468440121343