http://howisearth.files.wordpress.com/2010/02/cumulative-photovoltaic-production-1975-2007-logaritmic-plot-exponential-grwoth-of-solar-power.png
and
http://howisearth.files.wordpress.com/2010/02/cumulative-photovoltaic-production-1975-2007-exponential-grwoth-of-solar-power.png
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