Year	% of energy use
1960	72.12772797481358
1961	69.75669076459042
1962	69.21735666627437
1963	69.71001924883555
1964	68.1674166149277
1965	69.59110062973795
1966	68.7612210780664
1967	66.24065802237735
1968	65.51628627005589
1969	57.04397737823922
1970	54.34614762246006
1971	53.1285150843177
1972	50.17865809368395
1973	51.6138057783606
1974	51.93912149896558
1975	47.66496910927988
1976	45.07619164156122
1977	45.55322999474536
1978	44.44524521074298
1979	42.55067564121829
1980	39.59799921566689
1981	33.82147341478727
1982	29.806833522475262
1983	28.457639728718355
1984	30.653190835902873
1985	29.266406955060248
1986	31.010731967898714
1987	31.873419241691543
1988	30.31765714079619
1989	30.161399872283106
1990	28.63991379496435
1991	27.838617908301384
1992	29.7638545885607
1993	30.045610217644807
1994	29.982114220599748
1995	29.289125667865555
1996	30.736419072580258
1997	29.750836774240668
1998	28.02531670104357
1999	24.467962464225266
2000	22.622225912864995
2001	22.891121892831507
2002	23.08594362358901
2003	22.873755409252503
2004	24.089385983746826
2005	23.65894791983193
2006	19.713434264942112
2007	16.151274105087936
2008	13.16704986673885
2009	12.17033576041716
2010	11.519773035602626
2011	10.254935323575483
2012	10.330696612775611
2013	10.438919724940945
2014	10.96335223315643
2015	11.55755169241199