Year	% of total energy
1990	0.12372928050883739
1991	0.11395800102369717
1992	0.11982304956432337
1993	0.1291524890637851
1994	0.14938025784991363
1995	0.15522570144058206
1996	0.1697559804374238
1997	0.17671509087208623
1998	0.1894333503259393
1999	0.18700753187041108
2000	0.18654060852569063
2001	0.17833270032907025
2002	0.17525713059009085
2003	0.15913783463267184
2004	0.1631267355638571
2005	0.15586941896367779
2006	0.395580252633905
2007	0.8957475551771432
2008	1.0118712243096568
2009	1.0200851524462635
2010	0.8794475450451127
2011	0.968712325934672
2012	1.0086556277630743
2013	1.1677220159912005
2014	1.342185901161414