Year	% of total fuel combustion
1960	32.66838770241728
1961	33.042805932382095
1962	34.61474785603126
1963	34.565992865636154
1964	34.582071310909186
1965	35.07539712509126
1966	34.40755783153805
1967	34.71097775009908
1968	34.929157861918455
1969	35.11840811076644
1970	38.000772541662066
1971	37.72013961047611
1972	37.62079898541534
1973	39.64677697921889
1974	39.3455949598618
1975	39.604496498146084
1976	39.556199847044184
1977	41.64640577296697
1978	41.48926664730717
1979	41.01298106791355
1980	39.887156269032324
1981	40.109896602658786
1982	39.3447821632434
1983	39.65876341091278
1984	40.56996513871183
1985	39.678928220823465
1986	39.47477827050998
1987	39.340121919019126
1988	40.01580217386662
1989	40.31006948045215
1990	42.61964251393428
1991	42.64648109998562
1992	42.970024663251756
1993	41.84336819563679
1994	43.96417125482784
1995	42.64847932257861
1996	42.59289003105257
1997	42.639247774906686
1998	43.294345183275006
1999	43.89197733690923
2000	44.428866846587916
2001	44.072652671418226
2002	45.41425307812754
2003	46.79933665008292
2004	46.489529577344655
2005	46.909575687586496
2006	46.509627131476165
2007	49.834223003216074
2008	50.00892379082635
2009	48.71973885314262
2010	49.709485348347755
2011	51.71053083073123
2012	53.61719376907869
2013	53.854912166558236
2014	53.09642193113079