Year	% of total energy use
2000	12.559949071005672
2001	12.103106416877916
2002	17.415490659750475
2003	14.709710037558665
2004	12.844963010900049
2005	9.716165609811664
2006	13.117449775030089
2007	15.571911616712525
2008	17.172595638928172
2009	17.03167412258222
2010	13.02605931081017
2011	13.00115957876176
2012	12.290948061343336
2013	14.534224728000092
2014	15.18762472649288