The graph above shows the proportion of young adult participation in four divergent sports over three decades from 1990 to 
present
. 
It can be clearly seen that each area show different trends, but somehow ball games and biking have similar trend. Among all, ball games Correct article usage
the present
is
 everyone's favourite in 1990, whilst now swimming Wrong verb form
were
takes part
 as most popular sport. 
In 1990, almost 35% Verb problem
is
teenagers
 played ball games. Change preposition
of teenagers
Moreover
, their popularity Linking Words
declines
 by nearly 30% in 2000 and Wrong verb form
declined
it's
 Unnecessary verb
it
continue
 Wrong verb form
continued
dipping down
 to 20% in Verb problem
to drop
present
 day. Skating Add an article
the present
starts
 at 25% in 1990 and Wrong verb form
started
extremely falling
 in Wrong verb form
fell
next
 five years Correct article usage
the next
close
 to 20%. Fix the infinitive
to close
Nevertheless
, in 2005 biking and roller skating Linking Words
rising
 a bit to approximately 23% before they Wrong verb form
rose
keep 
Verb problem
apply
felt
 Correct your spelling
fell
down 
to almost 15% in 2020.
Rephrase
apply
On the contrary
, swimming is the only one that shows significant rises. After below 15% from 1990 to 1995, it steadily increased for Linking Words
next
 fifteen years reached around 25%, and Correct article usage
the next
have
 a peak of approximately 34% by the end of 2020. Jogging, Wrong verb form
had
however
, Linking Words
have
 the most fluctuation of all. Correct subject-verb agreement
has
Start
 below 10% in 1990, it's gradually rising in 2020 at nearly 13%. The number dipped close to 9% in 2015Wrong verb form
Starting
,
 before it increased to 15% in 2020.Remove the comma
apply