Year	% of energy use
1960	-13.507026696637741
1961	-11.579360701573279
1962	-8.951253644036317
1963	-10.931869236295794
1964	-13.270191288365535
1965	-11.229933440722693
1966	-11.071026511621607
1967	-9.078232179045237
1968	-9.465761836143706
1969	-8.905063409499475
1970	-8.243641009633969
1971	-30.64660201684039
1972	-31.75090225958682
1973	-30.34263656189771
1974	-27.080890488357102
1975	-22.74822191900366
1976	-23.09458892040317
1977	-19.913086613380997
1978	-17.903679041856137
1979	-19.19401346039672
1980	-12.968427916271665
1981	-9.272514608141615
1982	-8.250448150037437
1983	-10.655093765361906
1984	-13.058400493151515
1985	-12.235016917350988
1986	-12.385561603801682
1987	-11.043155515457933
1988	-10.850937841954158
1989	-14.548186647311297
1990	-21.025363045019112
1991	-19.23691957388988
1992	-21.72132638491305
1993	-20.867383569531896
1994	-23.56195042457921
1995	-23.19087936597538
1996	-22.897439797272227
1997	-23.540586017080575
1998	-24.973530369049467
1999	-23.926491463790672
2000	-26.237634944662464
2001	-26.692106025626
2002	-25.859262926284583
2003	-26.32099752833947
2004	-25.363801400738613
2005	-24.89260015010321
2006	-22.80924336335557
2007	-21.081200005800326
2008	-21.03742550550093
2009	-18.812719483396904
2010	-17.78401777114564
2011	-16.687857748317384
2012	-14.782849522004762
2013	-14.636310244531051
2014	-13.745040775634937
2015	42.152562658038576