Year	% of total fuel combustion
1960	48.13511611541168
1961	40.19815994338287
1962	39.9120050282841
1963	39.79257641921397
1964	40.56649063850216
1965	40.855704697986575
1966	36.804511278195484
1967	36.96925329428989
1968	34.366925064599485
1969	35.03589177250138
1970	31.417910447761194
1971	31.300200803212853
1972	35.48979123652214
1973	36.06762680025047
1974	36.38832315003394
1975	31.51460267149649
1976	28.815241119269697
1977	27.51449710057988
1978	25.430245331380448
1979	26.099815157116453
1980	25.578851412944392
1981	31.5176806501208
1982	33.08373042886317
1983	32.21413477342099
1984	32.066454255803365
1985	26.227470478558107
1986	26.486374896779523
1987	25.589419206440482
1988	24.62106490478041
1989	27.59759176539134
1990	25.269416573764396
1991	24.01466544454629
1992	24.48349102143271
1993	23.02185380557649
1994	22.58606213266163
1995	21.11310592459605
1996	18.70677175486569
1997	19.817123857024107
1998	23.573943661971832
1999	22.81735404392073
2000	20.12832263978002
2001	18.030077673111883
2002	16.76475266422777
2003	14.366038796738826
2004	15.349045346062049
2005	17.846715328467152
2006	14.766214177978885
2007	14.678899082568805
2008	16.118067978533094
2009	13.663551401869158
2010	14.551333872271623
2011	15.521675238795002
2012	15.894175553732568
2013	15.295786061588332
2014	16.685082872928174