Year	% of total electricity output
1990	1.82876744661768
1991	1.65643904503473
1992	2.00566157083539
1993	1.77762579080721
1994	2.13984198089987
1995	2.06653453196948
1996	1.62748022547114
1997	1.98923191477175
1998	2.39532069159381
1999	2.63271731690623
2000	2.66310517529215
2001	2.49733241275421
2002	2.89317333818692
2003	2.68494730240932
2004	3.61303216638809
2005	4.28348161223592
2006	4.60208931703226
2007	5.01029338042756
2008	5.67705220486968
2009	6.76680846273229
2010	6.81281342640788
2011	9.48905310077413
2012	11.423960176561
2013	14.988480137732
2014	19.2628536831965
2015	24.8400504227664