Year	% of total electricity output
1990	78.5478028035911
1991	72.7702896472613
1992	69.1217342968316
1993	78.396977465929
1994	80.6114931237721
1995	61.2290900462688
1996	67.9229122055675
1997	63.0573248407643
1998	59.742883379247
1999	69.6255335661622
2000	71.7018469656992
2001	63.9909502262444
2002	63.2991251682369
2003	62.1946994630175
2004	57.5734037595153
2005	55.1163708086785
2006	51.6944937833037
2007	56.5416564866846
2008	61.1415209650848
2009	50.8481878399483
2010	45.4918242862269
2011	55.558800623053
2012	54.8693482732963
2013	48.9918748119169
2014	49.17513473485
2015	52.8029423151374