Year	% of total fuel combustion
2000	11.350293542074361
2001	11.26543209876543
2002	11.317829457364342
2003	11.209439528023598
2004	11.532846715328468
2005	12.180451127819548
2006	12.816691505216097
2007	13.068181818181818
2008	12.928759894459102
2009	12.247324613555291
2010	11.021814006888633
2011	11.60092807424594
2012	12.42312423124231
2013	11.55234657039711
2014	13.918918918918918