Year	% of total fuel combustion
1995	2.0408163265306123
1996	2.6143790849673203
1997	2.4390243902439024
1998	2.659574468085107
1999	3.1413612565445024
2000	3.571428571428572
2001	3.2558139534883725
2002	3.619909502262444
2003	3.7815126050420167
2004	4.201680672268908
2005	4.905660377358491
2006	4.72972972972973
2007	4.178272980501393
2008	3.978779840848806
2009	3.908045977011495
2010	3.896103896103896
2011	3.925619834710744
2012	4.150197628458498
2013	4.826254826254826
2014	2.6229508196721314