Year	% of total energy
2000	13.714502131571537
2001	11.242620974993612
2002	11.36140391643254
2003	10.847845148448897
2004	10.787257232216566
2005	11.11426326254869
2006	10.998627822550704
2007	10.577800123149517
2008	10.521205237738185
2009	9.640173159888624
2010	9.471029535015992
2011	9.56918417625679
2012	10.449394264942365
2013	10.502959646581507
2014	11.37412005284207