Year	% of energy use
1971	-170.26060335380703
1972	-196.22730069751827
1973	-214.97244361181868
1974	-231.9924207542307
1975	-179.04742510215564
1976	-196.60184079208102
1977	-185.83624231443392
1978	-159.80361353177787
1979	-189.30379323080726
1980	-163.12369578042166
1981	-111.93610772925706
1982	-97.75394485791857
1983	-94.82624362330131
1984	-110.93440074856869
1985	-115.38548664720429
1986	-110.8877483507782
1987	-97.98380013083242
1988	-104.0178946223374
1989	-118.59477136662183
1990	-119.37113766424154
1991	-119.00609494914976
1992	-117.33164573151589
1993	-117.92332970440184
1994	-123.84511321138717
1995	-121.85043803635926
1996	-126.84620564898401
1997	-133.06888150202755
1998	-126.64395606479488
1999	-115.45560397561641
2000	-120.54223054457609
2001	-118.27119427009558
2002	-98.83530155318154
2003	-108.57220453258168
2004	-111.50833141079724
2005	-108.52898095995823
2006	-106.8865494704911
2007	-99.31676300188174
2008	-91.94765208445524
2009	-88.7090224519418
2010	-95.40260245352844
2011	-90.77969261499479
2012	-85.66447622836992
2013	-76.48616005650477
2014	-78.2114380864684