Year	% of total energy use
1990	28.132989090482614
1991	26.365659998988576
1992	35.35100679545076
1993	36.0116513660698
1994	25.793027323664102
1995	36.24094217176905
1996	39.463176403544495
1997	36.03129662438812
1998	38.59074327451731
1999	33.20550841099221
2000	31.72172757236539
2001	36.56408463058148
2002	42.387301818851356
2003	44.31585113045809
2004	42.61873496425837
2005	31.24104225842439
2006	26.71487862342261
2007	27.920051471770613
2008	27.914899301865777
2009	33.185290789156895
2010	1.712589720814037
2011	2.423407652750364
2012	2.3869037258391432
2013	3.368282377766106
2014	3.8051145604223318