The pie charts contrasts important types of energy consumption within USA between 1980 and 1990. Various forms of energy available are oil, natural gas, coal, hydroelectric power and nuclear power.
Overall, the charts illustrates the fact that oil has been the primary contributor to energy resource in both 1980s and 1990s.
Though oil is the most used energy resource, its consumption has fallen down significantly from 42% in 1980 to 33% in 1990. Natural gas was the second most favourite in 1980 with 26% usage, however, during the years the consumption of coal has picked up from 22% in 1980 to 27% in 1990, causing it to surpass natural gas at second place.
The usage of natural gas fairly remained constant with a mariginal decrease of one percent in 1990. Lastly, the usage of hydroelectric power remained exactly where it was at 5%, but the usage of nuclear power seems to double from 5% to 10%.