Year	% of energy use
1990	66.57829050910064
1991	64.08892045056918
1992	63.490439003523555
1993	59.21719954474225
1994	47.55860706559375
1995	47.20474463805986
1996	52.16177879201233
1997	51.36814438368431
1998	59.665211194398815
1999	46.06488303602701
2000	40.943013221056916
2001	39.96087129793254
2002	52.23619179745079
2003	50.196963309402456
2004	45.393610784309864
2005	48.55568295155331
2006	49.46950586433278
2007	55.17769905547914
2008	64.04264862902232
2009	58.657746693231985
2010	53.88070158107432
2011	51.04737197133944
2012	57.69746594880806
2013	55.47160187025385
2014	49.54466148392614