Year	% of total energy
1992	63.02906441953798
1993	60.036045230249755
1994	58.43449961371918
1995	57.39096966635395
1996	56.15307051968811
1997	58.26335457920019
1998	56.55556212492979
1999	56.21167907144496
2000	57.25288215276081
2001	56.88400179580897
2002	58.27151454255877
2003	55.833803294887986
2004	44.381699100286454
2005	45.14540171505516
2006	51.09413445968918
2007	50.83923253429673
2008	55.446511972718504
2009	53.55006837045565
2010	53.4137955704823
2011	53.460689333770404
2012	53.00099700897308
2013	53.13557090735841
2014	53.228038592790064