Year	% of GDP
1975	20.521614593148154
1976	17.331384422635207
1977	25.51797220428994
1978	23.07109664476243
1979	21.285197869101978
1981	26.24429969415226
1982	21.695760598503743
1983	21.082706766917294
1984	18.446202531645568
1985	17.25469168900804
1986	16.319727891156464
1987	14.570873786407768
1988	14.349025974025976
1989	13.83896103896104
1990	13.234864300626306
1991	14.737777777777778
1992	18.48023005032351
1993	18.764175257731956
1994	19.047428571428572
1995	17.623039215686276
1996	17.462946817785525
1997	15.964648364046635
2002	13.40775930324624
2003	13.349940119760479
2004	13.835977745724296
2005	14.068635097493038
2006	15.829512708434516
2007	15.349852309344792
2008	15.320524846454495
2009	15.66136058338131
2010	14.13007624730648
2011	14.008635402231784
2012	12.384904759061325
2013	13.49806493227263
2014	12.220140845070421
2015	12.519211097017063