Year	% of energy use
1971	-96.8502576804388
1972	-110.47233221760455
1973	-120.77263251051264
1974	-118.96025242259786
1975	-99.81915465923572
1976	-107.40067842247933
1977	-101.4797619097675
1978	-93.55975321200782
1979	-70.94189162949674
1980	-47.68730169297624
1981	-39.15818007730617
1982	-40.580432573473885
1983	-43.61657693871368
1984	-44.902354704586514
1985	-41.66743192124273
1986	-36.97683760373717
1987	-39.12562284879164
1988	-40.42198276367348
1989	-42.442693156934396
1990	-18.945720682162705
1991	-18.577298135470297
1992	-21.920847658691297
1993	-22.81482240560381
1994	-24.870520300147213
1995	-23.43309265012595
1996	-24.570685820006936
1997	-24.52772250386807
1998	-24.17492189045153
1999	-21.60344372462621
2000	-22.250948728849234
2001	-20.490784984190114
2002	-19.180216678502216
2003	-22.456706641259885
2004	-22.242518358733996
2005	-24.08940902143579
2006	-25.18140628540523
2007	-24.219561002840102
2008	-22.02193636716323
2009	-19.97371971303192
2010	-19.27395901793149
2011	-20.14452555625021
2012	-15.10640856575759
2013	-14.46708043012511
2014	-11.618766587929278