Year	% of energy use
1960	-14.359811407811822
1961	-12.839164755050467
1962	-9.318993828830532
1963	-11.12462054623463
1964	-13.024583773280645
1965	-11.365583137977614
1966	-10.977536992128767
1967	-9.997301743980195
1968	-9.833701667954147
1969	-9.13435943272085
1970	-8.124282275562745
1971	-57.5285471995612
1972	-55.636247892815874
1973	-59.04824537223531
1974	-53.658097343376774
1975	-45.23075445340559
1976	-47.865872941247154
1977	-44.63802280750202
1978	-41.04726825245218
1979	-39.00082303035166
1980	-29.285021342913694
1981	-21.515035235844525
1982	-23.242250362714604
1983	-24.516905493729354
1984	-26.468729092273094
1985	-25.846536071397363
1986	-24.013167799245682
1987	-23.764075489369826
1988	-25.339654195637184
1989	-27.25992642910748
1990	-23.29269945244355
1991	-21.274597120918582
1992	-21.869629226638494
1993	-21.259322918721946
1994	-22.85912285926064
1995	-22.637449249598664
1996	-23.29839819312139
1997	-24.218840096376038
1998	-25.611480455302118
1999	-24.413263675332626
2000	-25.817679691065152
2001	-25.69232480176123
2002	-24.523520563307205
2003	-24.190545425405194
2004	-23.919010153096284
2005	-23.507120109715338
2006	-22.080652233053566
2007	-20.188239331286884
2008	-18.96717055246177
2009	-17.054287356233566
2010	-15.553327533791137
2011	-13.846285849127348
2012	-11.362116716509535
2013	-10.549752581496605
2014	-7.347434466270563
2015	31.119059660162232