Year	% of total electricity output
1990	3.17527519051651
1991	2.89232453139964
1992	4.39846444140803
1993	4.73008771413434
1994	4.29543102173592
1995	5.03563850046248
1996	3.88003433989026
1997	6.60950016924292
1998	9.54685865784545
1999	11.2512846865365
2000	15.4550245471944
2001	15.4947122902807
2002	17.2805253646244
2003	17.4901485298575
2004	23.5557424077555
2005	27.0705733046405
2006	20.1727653416939
2007	26.2107030216706
2008	27.5726458378851
2009	27.6585218371217
2010	31.9823992589162
2011	40.2537682023333
2012	48.32741604508
2013	45.9603373341393
2014	55.9004474272931
2015	65.5059246208588