Year	% of total energy
1990	0
1991	0
1992	6.935139608027531
1993	6.965156367203278
1994	7.543757090035262
1995	7.464678411326591
1996	6.315738881675767
1997	6.9452100427473695
1998	5.22294178668606
1999	6.540391348835802
2000	7.8511181517003745
2001	5.683094787066458
2002	5.73125395924133
2003	6.050977198288392
2004	6.1587462264415445
2005	7.370293524200652
2006	7.053113276426454
2007	6.335350017502611
2008	6.375130357054178
2009	7.0213264755193086
2010	6.700173263277874
2011	6.672903394264241
2012	7.660045223564882
2013	8.27641060790027
2014	8.957645098753124