Year	% of total energy use
1990	1.510409999403222
1991	1.4849044915947753
1992	4.3907646521798185
1993	10.226371540874622
1994	12.537818975535235
1995	10.31906380748368
1996	38.17418640689481
1997	27.039832112048472
1998	25.90326627773117
1999	33.11921043359502
2000	29.180853171845527
2001	28.331168069719727
2002	36.39768900509385
2003	32.024269224421154
2004	32.786970791333594
2005	32.17229758453183
2006	31.565088935702867
2007	27.842652074454772
2008	25.696275085558952
2009	30.178020705218838
2010	32.51402351239388
2011	29.923765230699427
2012	24.564473053023416
2013	25.72974126324275
2014	25.718264132118446