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	-723.6143086564193
1972	-783.0711072970782
1973	-708.6334116048539
1974	-693.6449946391951
1975	-614.455843712665
1976	-652.0062557510104
1977	-622.0184514450686
1978	-618.6202405455779
1979	-539.5639484416957
1980	-487.35795147914183
1981	-355.05562196654796
1982	-285.0452204151229
1983	-269.736639911069
1984	-283.0271610898745
1985	-246.8227926768349
1986	-244.5548804705312
1987	-229.91772608743364
1988	-223.617119143843
1989	-244.78140681314002
1990	-162.4657487071801
1991	-161.63690050362513
1992	-180.1848824625753
1993	-178.81052745785294
1994	-180.67557921431208
1995	-184.42900929206448
1996	-175.02744773899025
1997	-188.47577042019267
1998	-193.04912642601312
1999	-205.94613351118437
2000	-218.11580849060263
2001	-211.37660778930353
2002	-211.44856419855705
2003	-210.19013921442522
2004	-216.7252210189976
2005	-212.4413777594384
2006	-199.39264741270023
2007	-195.29483153433608
2008	-219.64361079673077
2009	-229.1962367531313
2010	-256.6922248417338
2011	-262.8750399865585
2012	-248.25983239454894
2013	-250.31399000432924
2014	-226.99010277393438
2015	4.6109605449940405