Year	% of total energy
1990	1.9203616761591051
1991	2.050427373387447
1992	3.0974150198158164
1993	3.5957788401874824
1994	4.783921154812963
1995	5.9535132161995605
1996	10.102375683937733
1997	10.137513817341558
1998	9.141431874493248
1999	9.989008994636785
2000	10.078287941011581
2001	10.132082010957632
2002	10.67237125646575
2003	10.334425428737006
2004	10.423375676208579
2005	10.08749248944108
2006	9.4251486009258
2007	9.787622434383819
2008	10.923585009635996
2009	13.188547477142453
2010	12.546444097779819
2011	12.103052782531574
2012	12.338694193513799
2013	10.952491881470452
2014	11.034983927154322
2015	12.802690804086184