The pie charts 
provides
 information about the Change the verb form
provide
electric 
major Correct word choice
apply
source
 of energy Fix the agreement mistake
sources
is 
produced in the US
Unnecessary verb
apply
Overall
, Linking Words
while
 the energy Linking Words
production
 from oil, natural gas and coal accounted for the largest Use synonyms
propotion 
,Correct your spelling
proportion
hydro electric
 Correct your spelling
 hydroelectric
power
 and nuclear Use synonyms
power
 as a source of Use synonyms
engery
 were produced with similar percentages in 1980 and 1990. 
The percentage of oil in Correct your spelling
energy
engergy
 Correct your spelling
energy
production
 decreased Use synonyms
however
 in general, the proportion accounted for the largest percentage in the US was 42% in 1980 and 33% in 1990, Linking Words
whereas
 the Linking Words
engery
 Correct your spelling
energy
production
 from natural gas was approximately 25% in 1980 and 1990, the coal Use synonyms
production
 in 1980 and 1990 was 22% and 27% respectively. the Use synonyms
production
 of Use synonyms
Correct your spelling
hydroelectric
hydro electric
 Correct your spelling
hydroelectric
power
 accounted for an exact amount Use synonyms
of 
percentage in 1980 and 1990 at 5%, Change preposition
apply
while
 nuclear Linking Words
power
 Use synonyms
production
 was 5% and 10% respectively in 1980 and 1990Use synonyms