Year	% of energy use
1990	44.63674259151692
1991	46.88323614113437
1992	32.24612851467272
1993	35.31832628540805
1994	34.647705259498174
1995	34.53181411647171
1996	30.68477024391923
1997	30.799350912287473
1998	36.685699938872524
1999	37.84704111326521
2000	32.531254659908114
2001	35.517407759845035
2002	28.374017336519536
2003	24.96882951690601
2004	30.067261759120644
2005	25.76871566036212
2006	26.318939549648874
2007	22.52267121127912
2008	23.025613587711256
2009	14.621745406260905
2010	12.313255973487808
2011	10.445366109383512
2012	7.790223792825282
2013	7.226919054961803
2014	3.397203439143412
2015	-2.7059599538984824