From the graph, so that the price is recorded from 1977 up to 2015-la.From USD 76 per wat In the year 1977 reduced to USD 0.30 per wat in the year 2015.
From the chart it was noted that the price of solar cells from 1977 to 2015 from the high price of 76 USD per Watts in 1977 was reduced to 0.30. Watts per USD in 2015