Year	% of energy use
1990	83.760782005849
1991	84.0520822869101
1992	83.062434591766
1993	76.84859660827217
1994	78.69211763513044
1995	67.94388527097074
1996	57.029591437689284
1997	56.19179767970881
1998	54.717476511074025
1999	52.34674918150029
2000	53.841325318925435
2001	50.80496948344388
2002	47.80617774246945
2003	49.153066143050204
2004	53.7159450229167
2005	65.50540532548129
2006	69.4049372062522
2007	67.88669165675293
2008	64.16858514011541
2009	61.722946332493734
2010	57.972650228533965
2011	68.43693105144021
2012	70.3371527589433
2013	63.36345097121556
2014	68.75204872613939