The two pie charts give information about the proportion of oil, natural gas, coal, hydroelectric power and nuclear power as a main source of energy for the USA in 1980 and 1990.
Overall, the use of oil and natural gas comparatively decreased, whereas coal and nuclear power slightly increased. Besides this, hydroelectric power remained the same. Moreover, oil, natural gas and coal are significant energy producers.
To begin with, the biggest two fossil fuels, oil and natural gas depicted a reduction in energy production for the United States of America in 1980 and 1990 with 42% to 33% and 26% to 25% accordingly. In contrast, there is not any notable change in power generation via hydroelectric power.
On the other hand, remaining two fuels, coal and nuclear power showed high trend out of five main supply of energy for America in both the years (from 22 % to 27% and 5% to 10%, respectively). Additionally, coal surpassed the natural gas and nuclear,ear power has been replacing oil