Year	% of total fuel combustion
1995	78.91156462585033
1996	75.81699346405229
1997	73.17073170731707
1998	73.93617021276596
1999	71.2041884816754
2000	67.34693877551021
2001	70.23255813953489
2002	59.72850678733032
2003	56.722689075630264
2004	57.56302521008404
2005	56.22641509433962
2006	54.054054054054056
2007	55.431754874651816
2008	54.37665782493368
2009	61.60919540229885
2010	67.31601731601731
2011	67.97520661157024
2012	68.77470355731225
2013	68.53281853281852
2014	63.60655737704918