Year	% of total energy use
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0.00826388308335087
1998	0.012711739143287906
1999	0.012259846010631851
2000	0.012148763015775027
2001	0.011594562419866068
2002	0.011490812694408516
2003	0.01073009567252746
2004	0.011565824333956452
2005	0.011286711341045044
2006	0.024778291911328288
2007	0.023992021258046742
2008	0.02550226110163837
2009	0.023829216559088835
2010	0.023218048523021638
2011	0.022643407148207683
2012	0.02198532607306286
2013	0.021564964455421956
2014	0.021121165495383426