Year	% of total electricity output
1990	72.3926380368098
1991	72.5888324873096
1992	72.5075528700906
1993	71.8718718718719
1994	70.8255159474672
1995	70.2370500438982
1996	64.003294892916
1997	64.968152866242
1998	60.9828741623232
1999	63.1024096385542
2000	61.5969581749049
2001	62.8997867803838
2002	62.753036437247
2003	59.1264667535854
2004	58.5064935064935
2005	52.0965692503177
2006	57.2372372372372
2007	46.6551326412918
2008	49.5060373216246
2009	52.0196506550218
2010	47.3385012919897
2011	41.5972562469378
2012	42.5138632162662
2013	44.9904580152672
2014	40.3403403403403
2015	43.7441204139229