The given pie charts illustrate the five types of energy of namely oil,natural gas,coal,hydroelectric power and nuclear power in the USA, between 1980 and 1990. Units are measured in percentage.
Overall, the most significant energy on oil in 1980,which was dramatically fell in next year. By contrast, hydroelectric power and nuclear power was declined to given years.
Looking at the details, the most noticeable that oil increased to 42%,which was declined to 33% in 1980 to 1990.Furthermore, natural gas was steadily expanded to 26%,this figure was dramatic reduction to 1% in 1990.Meanwhile, coal was 22% in 1980,which was peaked at 27% in 1990 in the contrary of America.
In addition, the sources of hydroelectric power and nuclear power were decreased by 1980 to 1990,at 5% to 10% respectively.