Year	% of total electricity output
1990	1.09511587248447
1991	1.13615815803749
1992	1.23807264685852
1993	1.17545284149978
1994	1.33839482647381
1995	1.42656995665562
1996	1.46181849087072
1997	1.512754106503
1998	1.79937629199196
1999	1.67998800008571
2000	1.62878734965846
2001	1.93639064576506
2002	1.9417680124071
2003	1.49991000539968
2004	2.10226155358899
2005	2.47620028450235
2006	2.66912990470503
2007	3.4202354482524
2008	4.27121711589425
2009	5.74241832703595
2010	6.93110275067
2011	8.05367893181623
2012	10.437756244164
2013	10.405311482606
2014	12.5186110480228
2015	13.8023986710559