Year	% of energy use
1960	30.123405013188822
1961	32.10155618473748
1962	35.54408098191099
1963	39.07876185819013
1964	40.20023894513366
1965	42.870233150156565
1966	45.53633418693837
1967	48.34772919880829
1968	50.88125019385092
1969	53.49660862645511
1970	52.97383824384086
1971	49.514671462560536
1972	50.958963761743206
1973	52.222844396216765
1974	50.844595565273956
1975	47.060993295455816
1976	48.207752545006706
1977	45.72495008339965
1978	45.411076319674564
1979	44.18671831321566
1980	42.19850043964696
1981	39.30845915704561
1982	36.20098984743227
1983	33.98870139033545
1984	34.612786641789164
1985	32.70350500939387
1986	32.721173745501
1987	33.31215099335262
1988	33.6385009947858
1989	34.58888808838308
1990	11.509927787807536
1991	13.971365664197435
1992	12.683587500514802
1993	12.7006119823377
1994	11.074215330368354
1995	11.567192556767093
1996	11.214042333857222
1997	11.046621575505418
1998	11.798233322438799
1999	10.383030760553632
2000	9.210188767226882
2001	9.246024542280459
2002	7.424218287151161
2003	7.0559221735221405
2004	6.162211714514582
2005	6.200478941775483
2006	6.8834734368860655
2007	5.835541109711844
2008	4.947467703067118
2009	3.3219097233179564
2010	4.278815959685935
2011	3.5279118804698104
2012	3.1697662921633873
2013	1.243934704402031
2014	0.5926086392565784
2015	42.66328688728522