Year	% of GDP
1975	37.406248822221386
1976	32.82820749932882
1977	39.47672931460797
1978	38.03557902925341
1979	34.4289066463724
1981	48.1298113023253
1982	40.56822230138938
1983	39.902255639097746
1984	37.81645569620253
1985	34.92225201072386
1986	33.65079365079365
1987	30.102912621359224
1988	30.699675324675326
1989	27.694805194805195
1990	23.046972860125262
1991	29.39288888888889
1992	32.65132997843278
1993	34.83118556701031
1994	36.90857142857143
1995	34.76764705882353
1996	28.662598081952922
1997	26.006017299736744
2002	24.34969648983901
2003	25.4311377245509
2004	24.640428600865445
2005	24.291662024141132
2006	28.138983325238787
2007	27.11709183673469
2008	27.623935231714125
2009	26.920072922663596
2010	24.783822310624895
2011	21.930741740208592
2012	20.228219979697855
2013	21.416308320791227
2014	19.876713615023476
2015	20.98862473914645