Year	% of energy use
1971	9.007062594961017
1972	9.219129605907693
1973	9.37255056556077
1974	9.472073038071416
1975	11.390823420198652
1976	10.471191101923791
1977	12.89930977914996
1978	-0.6811362980308323
1979	-42.46711491674338
1980	-83.48444054404067
1981	-110.25597526217877
1982	-125.39581616311204
1983	-125.4832325784234
1984	-188.8314597263239
1985	-180.04564218732546
1986	-174.63762669691863
1987	-172.96483007456013
1988	-152.80634156806167
1989	-134.93151476833557
1990	-120.3542568035576
1991	-113.30340262770892
1992	-113.17562630105449
1993	-98.66573762668942
1994	-92.72233675460548
1995	-77.64373220204126
1996	-81.72000203021209
1997	-86.93333145985298
1998	-87.40244127489392
1999	-81.65919804265529
2000	-76.62865404115405
2001	-67.52976318676971
2002	-68.93427030626566
2003	-60.630525041512485
2004	-54.7252740044621
2005	-49.79309077852387
2006	-52.608458893020135
2007	-45.83924579586845
2008	-45.45508847578715
2009	-27.925455212873334
2010	-20.647901475569853
2011	-21.291263762654943
2012	-21.17150067003675
2013	-22.82375153200801
2014	-28.319820891588353