Year	% of GDP
1960	15.313822933922328
1961	14.841114858867389
1962	15.02231036192365
1963	15.29909176323207
1964	15.645960921551472
1965	16.189323652010216
1966	16.024539877300615
1967	15.411396077521179
1968	15.69230769230769
1969	17.02127659574468
1970	15.848273972960106
1971	16.894879168991718
1972	17.832711807428602
1973	18.724883820128866
1974	17.764196310871494
1975	15.270899707045624
1976	17.251944580263178
1977	19.050583478158117
1978	20.343604500597255
1979	20.541743281114346
1980	18.552434162657356
1981	19.681694122401304
1982	17.375498274562183
1983	17.54246928623201
1984	20.311505832777932
1985	19.119705350037417
1986	18.540795098993783
1987	18.37611722652859
1988	17.893843104797575
1989	17.72021313178223
1990	16.660674302012495
1991	15.334202969765654
1992	15.536030631592558
1993	16.137500603260833
1994	17.24247712026892
1995	17.24533096571628
1996	17.739110098918363
1997	18.60203870460837
1998	19.147465626277825
1999	19.563553771681647
2000	19.840116256517966
2001	18.225409175730935
2002	17.61350631040303
2003	17.700958052618844
2004	18.635213204066417
2005	19.3807914320126
2006	19.402722519784472
2007	18.26487879008416
2008	16.417219546804887
2009	12.972037413573878
2010	13.959764526107216
2011	14.358583574911963
2012	15.252886893851917
2013	15.721486511080379