The three pie charts illustrate the 
differents
 percentage Correct your spelling
different
in
 Change preposition
of
spenditure
 by national authorities in Someland during a period of 30 years.
Correct your spelling
expenditure
expenditures
overall
,Linking Words
it is clear that
Linking Words
,
 Remove the comma
apply
the 
Higher Correct article usage
apply
Education
 Use synonyms
was 
increased the proportion of spending in 1980 Unnecessary verb
apply
and1990
. Correct your spelling
and 1990
While
Linking Words
,
 the proportion of spending on K-12 Remove the comma
apply
Education
 and other had fallen over that period from1980 to2000.
Use synonyms
According to
 what Linking Words
it
 shown, Correct your spelling
is
expenditrue
 on higher Correct your spelling
expenditure
expenditures
education
 went up from 35% Use synonyms
to45
% before falling to 40% ,so it was an Correct your spelling
to 45
overall
 Linking Words
increased
 of 5%. the percentage Replace the word
increase
consuption
 in K-12 Correct your spelling
consumption
education
 was 25% in 1980,Use synonyms
while
 it was a Linking Words
propertion
 Correct your spelling
proportion
decreased
 of 7%. Between 1980 and 2000, Replace the word
decrease
Enviromental
 services Correct your spelling
Environmental
was
 4%,5%mand9% respectively of expenditure. The percentage of spending on transportation and health and human Change the verb form
were
were fluctuated
, Change to the active voice
fluctuated
have fluctuated
Linking Words
however
 it was an Add a comma
however,
overall
 Linking Words
increased
 of 6%.Replace the word
increase