Year	% of GDP
1977	38.3466546950071
1978	33.5322330762222
1979	39.2741874881086
1980	38.7836422584385
1981	40.7397798391913
1982	39.1060967405545
1983	41.2160816953956
1984	40.5253603784972
1985	41.551542024289
1986	36.8685262986883
1987	30.2022479512445
1988	29.1244316933221
1989	38.1052649958442
1990	49.1948653961094
1991	52.5181394723311
1992	53.6675500069387
1993	55.4606142931812
1994	56.1246502066434
1995	59.3089041726108
1996	57.0536792857119
1997	59.1780482813957
1998	55.8462407981743
1999	56.3726548265235
2000	61.5915619870142
2001	60.6289541917909
2002	56.7747396420961
2003	51.0742710306225
2004	49.3934497743479
2005	52.6728460632034
2006	47.8938948370627
2007	45.8255704329415
2008	46.6233960748145
2009	47.8300321991499
2010	51.1035216388909
2011	55.9389459378668
2012	61.5684824607505
2013	63.6780094016642
2014	60.1437164504007
2015	51.3343394249168
2016	34.0265265972305
2017	36.6887870821277
2018	55.4977596612002