Year	% of energy use
1971	-1471.6745848982869
1972	-1572.5370846752783
1973	-1524.1816480433272
1974	-1410.0024297788505
1975	-1164.8692645550411
1976	-1191.2434736975767
1977	-1087.9013189319144
1978	-952.0773641869004
1979	-814.3831159802647
1980	-633.5064430889225
1981	-458.1523249489734
1982	-322.6832018346189
1983	-287.3302208721294
1984	-268.93648272372457
1985	-227.16499903841583
1986	-253.141669902002
1987	-242.0200137054983
1988	-262.94150529863657
1989	-263.448338557109
1990	-289.8941730738789
1991	-274.55089148553776
1992	-269.0813140151296
1993	-261.1378779917054
1994	-241.51307879552886
1995	-237.5397766937578
1996	-233.9899826926993
1997	-230.81841902641452
1998	-241.6861678952141
1999	-225.77691757506565
2000	-238.30748583120112
2001	-211.73488042124822
2002	-190.78466534095782
2003	-206.52660077279705
2004	-205.2613463371197
2005	-200.26356776395798
2006	-188.67586441955996
2007	-176.55149464884823
2008	-166.5591121986847
2009	-144.99682124691674
2010	-144.13707705760888
2011	-149.07486150208447
2012	-140.14453488043915
2013	-138.2177337989913
2014	-126.96788342897929
2015	64.96736332553556