Year	% of total energy use
1971	4.424253111141422
1972	4.3120716391502025
1973	2.908880410770962
1974	3.0092114605570632
1975	2.205991695214839
1976	2.005337879152154
1977	2.4945456384551457
1978	2.4411894183050715
1979	2.556550036708174
1980	2.4097236761408314
1981	1.62161365879528
1982	0.870241002199485
1983	0.7034760040807935
1984	0.51904706152017
1985	0.6762876989616857
1986	0.86773171903243
1987	1.0854230212485898
1988	1.1731684072930104
1989	1.3354064150561027
1990	1.1686280964702507
1991	1.2469916971633608
1992	0.9578859580357041
1993	0.41949083325322534
1994	0.6897657957993166
1995	0.4956555705219492
1996	1.499915619837052
1997	1.503753361462662
1998	1.3964112961147235
1999	0.572060894369286
2000	0.6091492050129691
2001	0.7089342998280004
2002	0.6991348697722748
2003	1.1076877790842563
2004	1.0195120418970625
2005	0.6273821177426401
2006	0.6523671150293503
2007	0.6808495578495246
2008	0.6856623010069641
2009	1.6503721524161779
2010	2.0741416291047132
2011	1.285868840797599
2012	1.0873479909522423
2013	1.8714587741452917
2014	1.616762345081126