Year	% of GDP
1981	44.5953158184391
1982	38.805734818273
1983	32.4881517713054
1984	29.2618252981681
1985	26.1711880152822
1986	26.4728053859951
1987	27.7816715944429
1988	25.3336178355742
1989	26.9850875862155
1990	34.6569629629221
1991	22.8132725855429
1992	29.6099738647705
1993	34.5164472814412
1994	33.2693166629126
1995	31.4531122342142
1996	30.9356305241181
1997	31.6425232313073
1998	27.1629651684971
1999	34.2684558335072
2000	41.4166249257206
2001	30.6861889787594
2002	27.1212466851568
2003	24.945260913737
2004	26.7223719677846
2005	28.4520240798308
2006	32.7532601093225
2007	26.3644189528278
2008	30.464640772788
2009	21.6036697653859
2010	25.7487300153167
2011	27.4629219134133
2012	28.1325722277573
2013	21.8640517291543
2014	22.4437011815914
2015	17.1622744401005
2016	15.586326801562
2017	18.2051500228031