Year	% of GDP
1970	13.26038136736593
1971	18.742817699528928
1972	22.679058364397367
1973	25.104266969496496
1974	29.381200910162214
1975	36.98276715174772
1976	42.81369338749221
1977	39.48334256821161
1978	36.96880081685976
1979	36.35036577083937
1980	33.02539063357286
1981	32.87960207420019
1982	34.942168046463415
1983	38.003712657707204
1984	38.34069637618274
1985	38.329178831947786
1986	43.37851702794483
1987	34.34105589673059
1988	31.05917809674662
1989	29.20262911093547
1990	26.245314238680262
1991	31.01453766551178
1992	33.299866081762694
1993	36.81483697751492
1994	38.44027270159623
1995	37.89920522831492
1996	36.596061095450786
1997	39.57638860057072
1998	44.03556403233229
1999	46.01328206505773
2000	40.51178964975863
2001	41.815676804788076
2002	44.53830714467892
2003	42.12548599587429
2004	43.942919631340125
2005	43.68435090500446
2006	44.87775572415954
2007	53.11805426364179
2008	64.21337912343674
2009	71.43726731263558
2010	67.69726287960827
2011	69.55268022181146
2012	69.143571815315
2013	69.6306612918518
2014	63.87876798860582
2015	73.71754339794178