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	-433.78659318929067
1972	-448.7436212148362
1973	-448.6741148076387
1974	-456.7544875342456
1975	-441.8898489641338
1976	-470.92808147657973
1977	-452.60904961964707
1978	-430.5525444522738
1979	-388.24184273825927
1980	-362.840016240904
1981	-274.1590484792387
1982	-229.4806026264111
1983	-217.60495645753386
1984	-226.51889236266564
1985	-203.04780344422178
1986	-198.9733336677806
1987	-189.79709531126537
1988	-182.62489325975346
1989	-195.57198152638563
1990	-137.33763612396683
1991	-136.36832880177957
1992	-145.73555296005125
1993	-144.3672106446544
1994	-147.32141482522525
1995	-150.0554660115153
1996	-138.36764188876307
1997	-152.88166462248986
1998	-152.4985843674349
1999	-159.84806650839295
2000	-169.43229045554924
2001	-161.287465038691
2002	-166.37488775892672
2003	-171.9804520979339
2004	-178.2474749603918
2005	-172.3436078860802
2006	-165.54211659950374
2007	-162.0383481844251
2008	-184.52031768281557
2009	-193.37151129410438
2010	-213.7812484042003
2011	-218.43168433892475
2012	-210.7513781863107
2013	-213.04915732857862
2014	-196.24133197656997
2015	4.6109605449940405