Year	% of total energy use
1990	2.602437629638412
1991	3.3152301863971556
1992	3.8729737244512057
1993	4.674958106938128
1994	16.816669802419685
1995	17.17537699405965
1996	14.302845409664734
1997	8.251923602943442
1998	7.4082003923206905
1999	7.681564250698959
2000	5.663692096368577
2001	6.322356734059882
2002	6.4713853405791095
2003	5.630641696800347
2004	6.211224667602935
2005	6.281177275213756
2006	5.546282644769997
2007	4.268639799580927
2008	4.729006860310209
2009	5.212127312234719
2010	6.43491630649094
2011	3.727759492898519
2012	4.273651273401499
2013	6.0406936221297665
2014	4.2738713585159935