Year	% of total electricity output
1990	76.3841901146959
1991	75.6826169234928
1992	68.6650072850899
1993	73.2539744287974
1994	78.4925982274385
1995	76.4046259013016
1996	82.9920206632535
1997	71.6444344804394
1998	69.7463082165846
1999	79.8608192050815
2000	75.5246376811594
2001	74.3381980571797
2002	76.5041516806536
2003	78.7885950022561
2004	81.650877933989
2005	80.1696565150883
2006	80.6007625778852
2007	81.533391279154
2008	84.0108691765884
2009	72.8779156240704
2010	72.1206919763059
2011	83.46528973035
2012	79.5501941031153
2013	73.9986754585505
2014	74.0383106787808
2015	68.236811220424