Year	% of total electricity output
1990	23.5043544112079
1991	22.3496478237313
1992	21.2356057620736
1993	21.9369821742405
1994	22.2517442803829
1995	21.9480769230769
1996	20.955749002539
1997	20.5158485657561
1998	19.4104754947114
1999	21.4366012117673
2000	17.7034411271643
2001	18.4325544535434
2002	14.6462607915686
2003	14.0644863053276
2004	12.9981539798024
2005	12.1409513294691
2006	11.7332570814595
2007	13.0593227788922
2008	11.9009462759463
2009	10.0690647482014
2010	10.0479577100193
2011	9.32683633406604
2012	8.87941297956605
2013	8.88188039274026
2014	8.87090779127949
2015	8.25928551410343