Year	% of energy use
1960	-14.359811407811822
1961	-12.839164755050467
1962	-9.318993828830532
1963	-11.12462054623463
1964	-13.024583773280645
1965	-11.365583137977614
1966	-10.977536992128767
1967	-9.997301743980195
1968	-9.833701667954147
1969	-9.13435943272085
1970	-8.124282275562745
1971	-59.20827275389383
1972	-55.80479082921761
1973	-58.951971819601916
1974	-52.322789217175966
1975	-44.7583346801086
1976	-46.85159778477586
1977	-43.634700611789626
1978	-40.47874341531162
1979	-37.22184174697559
1980	-27.230160261421844
1981	-20.474449686914042
1982	-23.049526158066424
1983	-24.675448742702983
1984	-26.341061008943726
1985	-25.471536370114624
1986	-23.625626915091193
1987	-23.712284592494417
1988	-24.91513411244544
1989	-26.4054842722341
1990	-23.309106640114845
1991	-20.954193527028682
1992	-21.437516170607548
1993	-20.634822478838423
1994	-22.032106784338588
1995	-21.758179204580728
1996	-22.418821449338584
1997	-23.2375251984508
1998	-25.022420533975616
1999	-23.856801818250243
2000	-24.96651594808753
2001	-24.756508240478468
2002	-23.97641542595719
2003	-23.24752268339049
2004	-23.007836754819802
2005	-22.675095974166876
2006	-21.28116163963318
2007	-19.410077232673814
2008	-18.316950777722614
2009	-16.2925010765623
2010	-14.366982636819811
2011	-12.699107762724442
2012	-10.476500051610824
2013	-9.78422133394133
2014	-6.468368471839688
2015	31.119059660162232