Year	% of GDP
1977	53.4655609349658
1978	50.3927476790968
1979	44.373489145883
1980	43.1458526005861
1981	44.5293497200559
1982	44.5737524985323
1983	47.2180093330301
1984	45.9950098175602
1985	46.3598008947029
1986	44.9459605611601
1987	51.4265525179024
1988	50.7598161633556
1989	52.4167236872607
1990	53.3739240809186
1991	53.4275877780461
1992	55.4379997138108
1993	54.7128255222526
1994	50.3213313763042
1995	59.1707570871865
1996	62.1375568086616
1997	69.3672603871149
1998	71.4954912000853
1999	75.9465453585185
2000	76.3659081816879
2001	80.052937312127
2002	83.457117319722
2003	82.5767668191879
2004	77.3107668689752
2005	75.5136219882015
2006	74.1175091944732
2007	76.3894472116285
2008	82.5459484311284
2009	97.1625343660054
2010	99.2607055094111
2011	99.3386015758829
2012	91.7568661472278
2013	90.5953017265762
2014	80.9357797162666
2015	64.9460800019445
2016	62.3288157212761
2017	60.2277419623473
2018	57.7900302579938