Year	% of energy use
1990	69.27508989484407
1991	71.09563367386484
1992	60.31119750798083
1993	57.628693067610406
1994	66.79299053974825
1995	55.859528041946724
1996	52.238483181656534
1997	54.38360506300225
1998	50.63890400476423
1999	54.060761967595674
2000	52.52181300549748
2001	47.83570343293132
2002	42.107970839621636
2003	40.98034458180428
2004	43.43812239939404
2005	54.266883533038026
2006	58.34514943927937
2007	58.175861424790966
2008	57.69386027271006
2009	49.888463026206345
2010	78.44050318137987
2011	78.99874734250032
2012	78.91510799793082
2013	76.4981837740342
2014	75.04470837028974