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The pie chart illustrates the most used sources of energy

The pie chart illustrates the most used sources of energy (oil, natural gas, coal hydroelectric power and nuclear power) in 1980 and 1990 in the United States of America. Overall, oil was most the employed energy in both years, followed by natural gas and coal. In 1980 coal was the least favourite source of energy, together with hydroelectric power, while in 1990 the graph indicates that USA preferred coal over hydroelectric energy. Whereas natural gas’s percentage minimally changed from 26% in 1980 to 25% in 1990, a significant decrease is noticeable for petrol, which descended from 42% in 1990 to 33% in 1980. On the contrary, coal and hydroelectric energies increased respectively from 22% and 5% in 1980 to 27% and 10% 10 years later, in 1990. Hydroelectric energy’s percentage remained unchanged in 1980 and 1990 and it’s the least employed source with 5%.

The pie chart illustrates the most This phrase/word (depending on the context) can be potentially replaced with :exploited
used
 sources of You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy
 (oil, natural gas, coal hydroelectric power and nuclear power) in 1980 and 1990 in the United States of America.

Overall
, oil was most the employed You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy
 in both years, followed by natural gas and coal. In 1980 coal was the least Possible spelling mistake. ‘favourite’ is British English.favorite
favourite
 source of You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy
, together with hydroelectric power, while in 1990 the graph indicates that USA Consider using “to” with “prefer”.preferred coal to hydroelectric energy
preferred coal over hydroelectric energy
.

Whereas natural gas’s percentage minimally
This phrase/word (depending on the context) can be potentially replaced with :alteredadjusted
changed
 from 26% in 1980 to 25% in 1990, a significant decrease is noticeable for petrol, which descended from 42% in 1990 to 33% in 1980. On the contrary
, coal and hydroelectric You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energies
 increased respectively
 from 22% and 5% in 1980 to 27% and 10% 10 years later, in 1990.

Hydroelectric You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy’s
 percentage remained unchanged in 1980 and Use a comma before ‘and’ if it connects two independent clauses (unless they are closely connected and short).1990, and
1990 and
 it’s the least employed source with 5%. 