Year	% of total electricity output
1990	14.851353910244274
1991	17.759173667432147
1992	16.65350447817685
1993	16.8074255220502
1994	16.045706078655005
1995	16.80906726010833
1996	16.46519760275131
1997	16.127595131715864
1998	16.73093942537987
1999	18.1296332882847
2000	19.737524709698945
2001	19.677486374386678
2002	19.617969485363478
2003	18.517554656415122
2004	17.984503899050125
2005	18.723030326515435
2006	20.464807532298554
2007	22.27755833786624
2008	25.560116028332057
2009	26.376435077658858
2010	25.262159272449512
2011	23.919627258019748
2012	23.90347298227811
2013	24.202198087655297
2014	22.935822540156007
2015	23.41813143577586