Year	% of energy use
2000	12.506083520008056
2001	11.992235946825767
2002	12.128594661161674
2003	13.039464602341866
2004	13.662915111293028
2005	12.718452650853049
2006	12.62161099444955
2007	13.725773784529096
2008	14.663146770627181
2009	16.914411261678648
2010	19.71719245846556
2011	18.17462724429701
2012	0.82274821716651
2013	-4.63213520039166
2014	-5.809741917825311