Year	% of energy use
2000	28.96470687249738
2001	29.04136040141475
2002	29.11484188512643
2003	29.438267852090842
2004	37.26723348854841
2005	28.177561375729088
2006	27.597499361718803
2007	30.259078608811503
2008	24.33886127451269
2009	24.20298880737729
2010	25.42651958813628
2011	28.989955489590763
2012	26.144199064877505
2013	23.97239501260846
2014	27.387258184187196