Year	% of total fuel combustion
1990	0
1991	0
1992	0
1993	0
1994	0
1995	14.13158451449122
1996	10.991424388203304
1997	8.057360982152067
1998	14.123491838183108
1999	14.34343434343434
2000	14.083889083889083
2001	14.066695539194454
2002	14.229612299465241
2003	14.1589069706727
2004	14.253837915030346
2005	14.2430464812395
2006	14.296154197497032
2007	14.394904458598726
2008	15.117345067840116
2009	13.42471275952429
2010	13.270142180094787
2011	13.93853427895981
2012	14.395910780669146
2013	13.334718039256414
2014	13.677221654749744