Year	% of total fuel combustion
2000	3.131115459882583
2001	3.0864197530864197
2002	3.10077519379845
2003	3.2448377581120944
2004	2.7737226277372264
2005	3.1578947368421053
2006	3.129657228017884
2007	3.125000000000001
2008	4.089709762532982
2009	3.80499405469679
2010	3.6739380022962105
2011	3.82830626450116
2012	3.3210332103321036
2013	3.369434416365824
2014	4.45945945945946