The line graph illustrates the 
percantage
 of 18-25 aged Correct your spelling
percentage
students
 in the Use synonyms
universities
 of Singapore, Malaysia, Use synonyms
Philippines
, and Thailand between 1961 and 2011. 
Use synonyms
Overall
, 18-25 year olds Linking Words
students
 in Use synonyms
universities
 increased Use synonyms
throught
 the period. Correct your spelling
throughout
through
While
 Thailand's Linking Words
universities
 Use synonyms
has
 Change the verb form
have
a
 highest Change the article
the
percantege
 of Correct your spelling
percentage
students
 Use synonyms
from
 these ages, Change preposition
of
Philippines
 Use synonyms
universities
 Use synonyms
expreinced
 Correct your spelling
experienced
lowest
 proportion. 
Between 1961 and 1991, Thailand's Change the article
the lowest
universities
 saw Use synonyms
fluctations
 in Correct your spelling
fluctuations
proportion
 of 18-25 ages Add an article
the proportion
a proportion
students
 (25%). Use synonyms
Similarly
, Singapore's Linking Words
universities
 showed Use synonyms
same
 Change the article
the same
osillation
 but Correct your spelling
oscillation
in
 Correct your spelling
an
upward
 trend. After 1991, Add an article
an upward
the upward
involvment
 Correct your spelling
involvement
to
 Singapore's Change preposition
in
universities
 from these ages rose sharply and reached to highest Use synonyms
percantege
 (almost 42%).
From 1961 to 1991, young proportions of Correct your spelling
percentage
students
 Use synonyms
whose
 went to Correct pronoun usage
who
universities
 from Malaysia and Use synonyms
Philippines
 rose from nearly 2% and 7% to 15%, respectively. After that year, Use synonyms
proportions
 in Correct article usage
the proportions
Malaysia 
Correct your spelling
Malaysian universities
Universities
 stayed Use synonyms
same
, Correct article usage
the same
while
 Linking Words
Use synonyms
Correct article usage
the Philippines
Philippines
 ones showed slightly Change noun form
Philippine's
Philippines'
grow
.Replace the word
growth