Year	% of total energy use
1990	0.9528423496513141
1991	0.8917840632858576
1992	0.7971086345639496
1993	0.957521591153409
1994	1.178305555011353
1995	1.0617421340932758
1996	1.0768318822813607
1997	1.058163732794849
1998	0.987912216498559
1999	1.1295323367400851
2000	1.2444421648629058
2001	1.3773485195304958
2002	1.3016854173779122
2003	1.1302581274526222
2004	0.881375907791066
2005	1.1894109513946705
2006	0.9900026259989919
2007	0.9645451023344825
2008	0.5941067956121793
2009	0.6143768097064266
2010	0.6931347205598926
2011	0.6555643390481651
2012	0.6540350307942064
2013	0.520312679642313
2014	0.60888813034448