Year	% of GDP
1963	16.092856541207
1964	18.6726674380599
1965	17.973864085865
1966	19.3459060811167
1967	20.9660669938065
1968	21.8102148982997
1969	21.7151793483314
1970	21.056960647795
1971	23.5272778823931
1972	23.9808483816826
1973	20.2808028841493
1974	16.258276018526
1975	18.6607057822889
1976	22.8935213040819
1977	26.4318464170945
1978	28.5052235316951
1979	27.5194485102906
1980	28.8249483925934
1981	22.5292801167038
1982	27.2333889161488
1983	33.4522620114754
1984	33.9878644136122
1985	33.6467718416771
1986	33.5654374705664
1987	32.2425626361844
1988	31.4247518851481
1989	30.6626429946817
1990	30.2157350778947
1991	29.6626876144504
1992	31.9285496645032
1993	32.9505200938139
1994	30.6830784896865
1995	28.8179174628567
1996	27.390185598214
1997	27.122958249256
1998	27.3484953264927
1999	26.961972166095
2000	24.2131945074465
2001	26.291428842438
2002	26.5990440140822
2003	25.7652455996493
2004	24.4609716147306
2005	24.1368779387392
2006	21.6440043959721
2007	24.4313540044793
2008	26.2799559302465
2009	28.5973476837612
2010	28.2739134706011
2011	29.2277254250334
2012	29.4624234981838
2013	30.680082773385
2014	31.3961499244317
2015	34.2042306850327
2016	37.9441097465305
2017	38.3125026546992
2018	40.7353238277902