Year	% of energy use
1990	98.07050022962976
1991	98.1804916179142
1992	93.30849753679674
1993	82.51092115333218
1994	77.06829039703922
1995	84.31898208642853
1996	57.65076780550798
1997	70.37275550974657
1998	70.49797841782389
1999	64.1211544062544
2000	68.07252059962275
2001	69.58601417428436
2002	60.18360905958181
2003	64.51256979926984
2004	63.81404985308544
2005	65.4283630828704
2006	66.45050594272627
2007	70.78468308489137
2008	73.21742609773611
2009	68.10664490396441
2010	64.65123040784859
2011	67.34421675318019
2012	72.70666159921605
2013	72.0464797313162
2014	71.3413045219602