Year	% of total fuel combustion
2000	78.08219178082192
2001	78.24074074074075
2002	78.13953488372093
2003	78.31858407079645
2004	79.41605839416059
2005	77.14285714285714
2006	76.45305514157972
2007	76.8465909090909
2008	76.12137203166226
2009	78.12128418549347
2010	78.18599311136623
2011	76.33410672853829
2012	76.75276752767527
2013	77.25631768953069
2014	75.13513513513513