Year	% of energy use
1960	40.52218500967774
1961	42.08291926048152
1962	40.95322358029753
1963	40.048171473037584
1964	42.27563320404097
1965	44.18341710888378
1966	45.65778199285159
1967	48.040142765614156
1968	49.92849487477307
1969	51.01845422807937
1970	52.22448379003058
1971	51.18998291477085
1972	50.74912098383495
1973	50.3761893592787
1974	50.1076758604374
1975	46.28613293463854
1976	42.6170455668134
1977	38.25930000889592
1978	36.979242621569064
1979	40.09668271614885
1980	39.106481385641004
1981	35.2024271495814
1982	29.7196862966637
1983	27.421639961663942
1984	23.88772072966847
1985	20.066862152383298
1986	12.159464745660387
1987	14.408996123516435
1988	12.114385516399091
1989	9.673488385946689
1990	10.183479104534833
1991	7.904175384578899
1992	8.4344784121274
1993	9.163307824239128
1994	14.042114668116628
1995	15.02605597392273
1996	11.162091233144292
1997	10.170491299574135
1998	15.823022809275736
1999	16.153758435149108
2000	16.37860002843687
2001	16.12910373827049
2002	14.554768214940584
2003	21.201504920272935
2004	23.580332601789127
2005	24.026251657519396
2006	21.72167331595184
2007	17.58464164524037
2008	13.913424222116614
2009	12.671970705110272
2010	8.144425569217557
2011	11.981943067090148
2012	16.45899945865781
2013	16.41409443946654
2014	17.084552590758506
2015	19.47815263060601