Year	% of energy use
1960	56.54168451386573
1961	54.91717075249017
1962	51.8003663459867
1963	53.9396990888959
1964	51.93673020908503
1965	51.86771001260768
1966	55.96295962739393
1967	54.1783700780803
1968	53.57929308885324
1969	57.65539907272387
1970	60.03206076476716
1971	54.74492336944087
1972	44.39370218631187
1973	43.57068635910723
1974	39.88918970682667
1975	-10.484692991963335
1976	-36.74173887663867
1977	-42.09755430150947
1978	-109.06582521722011
1979	-152.88254281025124
1980	-200.15216138642592
1981	-206.63977095737428
1982	-216.65104419142116
1983	-248.25060304131733
1984	-260.85121153204307
1985	-263.91894984453626
1986	-258.45626978783696
1987	-310.27593168510674
1988	-369.2709583933807
1989	-437.02150950231334
1990	-467.10679692760397
1991	-504.26274267173056
1992	-565.3120050742612
1993	-559.8465235119402
1994	-639.8123527125191
1995	-687.1718419485251
1996	-812.0169751407922
1997	-784.4226389197659
1998	-719.7554368191473
1999	-696.5298446368796
2000	-771.4836461291793
2001	-744.0369402682679
2002	-843.4818788119198
2003	-768.2076939862142
2004	-764.5181762546292
2005	-736.3718270324574
2006	-693.0155447709351
2007	-680.4842868298784
2008	-588.7362513132662
2009	-594.1867865226072
2010	-512.2314821262578
2011	-611.5012802209877
2012	-584.3629134559587
2013	-494.81574777481774
2014	-582.8993393764791
2015	-581.3465734958886