Year	% of total electricity output
1990	7.16136834830684
1991	7.49680170575693
1992	8.83975104994181
1993	12.7342396724581
1994	10.4091969722839
1995	9.12931236798874
1996	9.0009949084099
1997	10.1686861487289
1998	10.8400933437049
1999	8.2856514084507
2000	8.20364725386384
2001	6.85819715340011
2002	10.8015614138281
2003	11.5991731654609
2004	12.670161883738
2005	13.1558237145855
2006	10.2595444729658
2007	10.8207076486474
2008	10.3128032158204
2009	12.2429510281959
2010	18.4233030464992
2011	13.1861633980487
2012	7.92152427353402
2013	6.67123404984157
2014	5.62924619864122
2015	7.0398574206092