Year	% of energy use
1960	-19.62735069391107
1961	-17.69993648149189
1962	-14.712290135190873
1963	-17.080467335975328
1964	-19.719407474459217
1965	-9.428977552076748
1966	-9.28289974825139
1967	-7.281293755340773
1968	-7.983780830992017
1969	-6.994056325173981
1970	-6.280469089062947
1971	10.489220762927022
1972	10.588866847606923
1973	12.446350275781505
1974	11.668040565418886
1975	13.018193752001435
1976	14.50406645832651
1977	16.272946140832623
1978	17.606082142161156
1979	18.66416081889386
1980	21.95816495524739
1981	24.153560026158463
1982	20.23415113812516
1983	18.896691452701326
1984	17.764492825117912
1985	19.860329812765546
1986	20.681776659570698
1987	22.304657016058588
1988	22.00159452926513
1989	24.106705214641472
1990	31.1728448356792
1991	29.084245042540886
1992	26.05930659785099
1993	26.411130692318437
1994	25.157386420498913
1995	26.688658954995656
1996	28.201416885104617
1997	26.988779391721202
1998	29.885119851042884
1999	30.172129547155752
2000	29.65150863688921
2001	30.40697036174339
2002	29.62967357564365
2003	31.218044150280264
2004	31.666878907239706
2005	33.40463342427296
2006	35.17322842106815
2007	37.20536770103028
2008	37.163174507389876
2009	34.7237487132016
2010	37.69592664275682
2011	36.462670547648855
2012	33.72130638046359
2013	33.973916812201914
2014	33.88993590203604
2015	35.50366383232124