Year NG LPG Electric
2005 0.46 2.57 0.02
2006 0.48 2.81 0.01
2007 0.51 3.06 0.01
2008 0.56 3.38 0.01
2009 0.62 3.71 0
2010 0.65 4.02 0
2011 0.76 4.22 0.01
2012 0.88 4.4 0.02
2013 1.06 4.16 0.03
2014 1.19 4.19 0.07
2015 1.31 4.22 0.11