Year	% of total energy use
1960	8.985334845700061
1961	9.058861200072734
1962	9.296964264064572
1963	9.710582460543977
1964	9.881204011573402
1965	8.616632810958109
1966	11.246171226659913
1967	10.915767915053728
1968	10.156443669466226
1969	10.685600252636817
1970	8.661778598702947
1971	8.455013645265794
1972	9.474262066898305
1973	9.134444169906027
1974	9.328397969226906
1975	7.171068875094669
1976	5.044173675662728
1977	10.722116150378543
1978	10.610255205266956
1979	9.999673354940299
1980	6.911383970215805
1981	4.353195019675578
1982	5.365454824083005
1983	6.200451525993287
1984	7.549957695106779
1985	8.416299456012927
1986	6.052340666897003
1987	6.329467257857132
1988	8.091627464340064
1989	3.2353205343541664
1990	3.960558591784935
1991	3.9075703819389926
1992	1.9792632709322848
1993	3.5359536178392132
1994	4.422171317248873
1995	3.1844388460036797
1996	5.683979114615158
1997	5.122084406418804
1998	4.393830459452072
1999	2.31243886757797
2000	3.7391241612135446
2001	4.480509941369996
2002	2.6601845495612184
2003	5.357341141473312
2004	3.752100925763952
2005	2.340783375425298
2006	4.919638776473177
2007	5.317964948450759
2008	4.993968941123075
2009	5.811819151447032
2010	9.098383882510047
2011	7.869784654201756
2012	7.188654709641261
2013	10.01403480156729
2014	10.7045933404571
2015	8.044254644777114