Year	% of energy use
1985	20.458928185377655
1986	20.50823851803526
1987	16.35267312734636
1988	13.538746907946608
1989	14.15542543089004
1990	19.591416753268614
1991	14.995180218926565
1992	13.401893006308512
1993	18.46466891958515
1994	14.244097799641342
1995	16.632044174292524
1996	17.8947985211136
1997	19.01189888243882
1998	17.581318181635634
1999	18.56450225709996
2000	18.692282528327773
2001	19.079488724482296
2002	17.970636932057925
2003	18.975880953040914
2004	19.696471537380983
2005	-28.457354028579214
2006	-29.66219584583662
2007	-44.771292997664304
2008	-58.85851697949158
2009	-131.59563241625318
2010	-297.585310718413
2011	-338.60393744944656
2012	-248.41581886811434
2013	-211.39727937126221
2014	-168.09339324974732