The two graphs show the main sources of energy in the USA in the 1980s and the 1990s. Write a report for a university lecturer describing the changes which occurred

The two pie charts illustrate 5 primary

sources

of

eneragy

Correct your spelling

energy

(oil, natural gas, coal, hydroelectric

power

, and nuclear

power

) in the United States between 1980 and 1990.

Overall

, oil had a large proportion of the main

sources

of

power

,

while

both

hydreoelectric

Correct your spelling

hydroelectric

power

and nuclear

power

had tiny fractions. Oil

,

Remove the comma

apply

show examples

had the biggest proportion of energy

sources

nearly a half in 1980, but

then

decreased to around a third.

Moreover

, Natural gases had the second biggest percentage of

eneragy

Correct your spelling

energy

sources

just above one quarter in 1980,

then

decreased slightly

at

Change preposition

to

show examples

exactly

a

Correct article usage

apply

show examples

one quarter. In terms of coal, it had 22% of energy

sources

in the first year,

then

grew gradually to 27% in 1990. there was a significant rise in the percentage of nuclear

power

from a tiny fraction in 1980,

then

doubled to 10% in 1990.

In contrast

, the amount of energy

sources

from hydroelectric

power

remained stable at exactly 5% in the entire period.