The pie charts illustrate five main sources of energy in USA over a decade from 1980 to 1990.
As transparent from the statistics, the proportion of nuclear power and coal energy witnessed an upward trend, while the opposite was true for oil energy, In addition, the figure for natural gas and hydroelectric power mostly remained stable during ten – year period.
In detail, comprising 42% at the first year, the oil utilizing experienced a slight decrease of 9% ten years later, but it still made up the largest percentage of all energy. In contrast, there were steady increases in nuclear power and coal. The former grew of 5%, from 5% in 1980 to 10% in 1990. Similarly, the figure for coal climbed from 22% in 1980 to 27% in 1990.
For the remaining sources of energy, natural gas and hydroelectric power, they stabilized at about 25% and 5% during a decade.