Year	% of GDP
1977	20.0548467950069
1978	21.4809423624304
1979	11.1742263549554
1980	7.82597129938158
1981	9.93351960331484
1982	13.3029899047251
1983	12.5959057564062
1984	13.2539138977758
1985	11.4204344369085
1986	8.82391850212581
1987	13.8280836182886
1988	17.7746851996177
1989	16.6355843406969
1990	16.3653140626722
1991	17.3583489482892
1992	5.05105788008555
1993	4.59591806748014
1994	5.4630281957859
1995	7.50488558641372
1996	6.60408716097284
1997	1.25252731609823
1998	12.8059744554764
1999	4.32072200723632
2000	9.51773245561027
2001	10.1327405685469
2002	5.46251133273925
2003	5.24180045231122
2004	4.58051269257965
2005	2.29388715201453
2006	7.50192358674773
2007	20.0357249646236
2008	14.3721830599733
2009	19.45483188154
2010	18.4022113860487
2011	10.2296607967969
2012	2.17337323662928
2013	13.8694778657825
2014	12.7554597710277
2015	8.13309567574247
2016	5.60121056481819
2017	12.1485092004706