The given graph introduces some listed 
activities
 which old people did in their leisure time, covering a specific period of time from 1980 to 2010 in America.
It is obvious that the popularity of the Use synonyms
activities
 experienced a direct proportionality with respect to time, particularly, hiking was on its way to surge steadily Use synonyms
as well as
 a dramatic rise in watching TV. 
In Linking Words
1980s
, approximately all Change the article
the 1980s
activities
 Use synonyms
sew
 a gradual escalation. In Correct your spelling
saw
case
 of going to Correct article usage
the case
Add an article
the theater
theater
, it uniquely faced a sudden decline from 50 Change the spelling
theatre
Use synonyms
percent
 to 30 Change the spelling
per cent
Use synonyms
percent
. In Change the spelling
per cent
1990s
, there were some sphere changes Change the article
the 1990s
due to
 climbing in Linking Words
theater
 activity from the low point, Change the spelling
theatre
in addition
 to a minimal fall in reading from 40 Linking Words
Use synonyms
percent
 to 20 Change the spelling
per cent
Use synonyms
percent
.
From Change the spelling
per cent
2000s
 to Change the article
the 2000s
2010s
, the mentioned Correct article usage
the 2010s
activities
 could be divided into 2 groups, the first section Use synonyms
such
 as surfing the internet, hiking, theatre Linking Words
as well as
 reading rocketed by nearly 30 Linking Words
Use synonyms
percent
 in mean. Parallelly, the least activity "watching TV" was no longer voluminous Change the spelling
per cent
to plunge
 dramatically from 70 Change the verb form
plunging
Use synonyms
percent
 to 65 Change the spelling
per cent
Use synonyms
percent
.Change the spelling
per cent