Year	% of energy use
1960	12.335653942186566
1961	12.586700771082118
1962	17.941880543194703
1963	18.02619834503623
1964	19.24357063385389
1965	18.820090522768627
1966	19.350595763955873
1967	16.25670021039854
1968	18.0882742089527
1969	19.435914726701185
1970	23.184991572491263
1971	-169.15405975901734
1972	-178.03327285813774
1973	-190.58336079113
1974	-180.27488211883818
1975	-148.9919696858608
1976	-162.7314447963284
1977	-159.7545123228645
1978	-144.77016253582954
1979	-133.33249228283816
1980	-116.25137564155668
1981	-104.52426386256593
1982	-81.65775581013807
1983	-73.30709077277756
1984	-70.53718811882011
1985	-59.67722900369322
1986	-63.691471465309796
1987	-57.67278182849716
1988	-62.15238157045489
1989	-62.35071613208728
1990	-70.21300453771896
1991	-77.4627109194952
1992	-73.9524733129406
1993	-72.68982669512195
1994	-67.74816504619925
1995	-66.34990699960835
1996	-65.7823486809894
1997	-63.24931596128539
1998	-61.0505955106643
1999	-53.81087169521815
2000	-55.78257286626543
2001	-52.87937997371004
2002	-48.67917633924673
2003	-53.23564134825709
2004	-52.75101095989267
2005	-52.980757783043146
2006	-49.512671748572096
2007	-44.07637414868512
2008	-40.104643161892795
2009	-33.298948185533405
2010	-31.72674059962257
2011	-32.687859980404156
2012	-29.035494676899827
2013	-27.807504619408892
2014	-18.825317099685826
2015	30.5365337775948