Year	% of GDP
1972	14.621926240945896
1973	12.221416933657657
1974	12.492502753359771
1975	13.020735541041143
1976	12.6744007407672
1977	12.977595900494924
1978	13.465838860970969
1979	15.36887364231615
1980	19.4505699582954
1981	16.658589279684584
1982	16.345303979081113
1983	13.232287468099294
1984	15.65766929103897
1985	16.89727010233711
1986	14.82232662165015
1987	10.695108779101488
1988	10.440814526753082
1989	8.290931057095957
1990	12.468377932293748
1991	13.678180102568868
1992	15.079383016346403
1993	15.120600276153024
1994	16.41971413789955
1995	17.458653118581775
1996	18.383109891892687
1997	18.640069720151057
1998	18.761578487692667
1999	17.698856110067762
2000	17.946994196606568
2001	17.23087543212785
2002	16.760928118075054
2003	17.28027718915321
2004	17.203983591813454
2005	18.393852019350028
2006	19.94379320357624
2007	20.970709408382604
2008	21.15142647794701
2009	18.961665524584863
2010	20.28603876121197
2011	20.80256176766132
2012	21.51329658457209
2013	21.549204089125134
2014	21.82969072885231
2015	19.679565807862964
2016	18.276565220673398
2017	17.823403398989374
2018	19.037964270731887
2019	19.529002666156508
2020	18.050122306578633
2021	20.67486619393782