Year	% of energy use
1971	-39.839774584194686
1972	-30.986948336537367
1973	-23.23097908450586
1974	-14.256349959396392
1975	-10.59816029616868
1976	-4.027216579065569
1977	-1.0169633245821856
1978	-6.279622775005504
1979	-9.617156230850918
1980	-0.004811922181046382
1981	-2.868230967723446
1982	-6.32141473284816
1983	-8.130950143480689
1984	-15.515331551233489
1985	-24.72479040928833
1986	-51.015242526061854
1987	-75.79163210536662
1988	-73.29867208580309
1989	-88.54320940105104
1990	-98.90170359463815
1991	-89.28232352982496
1992	-91.15051791450819
1993	-85.3296332053332
1994	-85.8953449635878
1995	-114.65330004238243
1996	-129.32605902032344
1997	-143.253532910338
1998	-153.08835732011445
1999	-194.0744051966839
2000	-180.2000858774915
2001	-180.45846332184504
2002	-171.15200159149222
2003	-185.32482452546176
2004	-189.6949927938788
2005	-190.20754209052075
2006	-193.685628623242
2007	-206.03410510293375
2008	-212.7163667407836
2009	-219.85897694743332
2010	-239.49373490998101
2011	-285.14359206075653
2012	-294.76243757500384
2013	-268.53275583504984
2014	-274.1331607460851