Year	% of energy use
1960	11.897830899402363
1961	13.58234755195065
1962	19.12600831595293
1963	23.80630934062458
1964	25.32552327495309
1965	30.20690542227872
1966	34.63771361128778
1967	40.01018795638566
1968	42.765947430241205
1969	46.00983513692332
1970	42.116742085607
1971	42.564090085243315
1972	45.626418813275016
1973	48.71153583280668
1974	47.27185443835344
1975	45.08599869416199
1976	48.495202386443445
1977	48.85995787910271
1978	50.061698208027174
1979	50.232088047547094
1980	48.02980287108314
1981	44.24968632120055
1982	42.11623190304574
1983	43.10359394496287
1984	42.899867578682596
1985	41.39994421423246
1986	43.907633617884336
1987	44.47392630496571
1988	44.072169004533784
1989	43.60711720713859
1990	46.993619579061104
1991	51.117853655038125
1992	51.690833846010165
1993	54.572366308446426
1994	56.41397322548782
1995	56.93509712870613
1996	58.85052786272256
1997	58.39315470212658
1998	60.36084305371715
1999	59.08026927553265
2000	59.82339485856504
2001	61.176461938025476
2002	60.34080530466235
2003	59.977743006387584
2004	59.73851082179519
2005	59.46621257583279
2006	60.01125617565039
2007	58.46423004665328
2008	60.00315351957363
2009	59.317546459835214
2010	60.66440970869531
2011	60.5645102225714
2012	60.69545859916011
2013	62.093783982408
2014	60.87591027910175
2015	61.40016936873751