The presented pie graphs 
illustrates
 the kinds of working tasks in the US business in the two observed years.
Change the verb form
illustrate
Overall
, the trends of jobdesks in the common offices had Linking Words
significally
 developed throughout two decades. Correct your spelling
significantly
The 
Phone things became the top Correct article usage
apply
activities
 in the early 1980s, but lately in the 2000s Fix the agreement mistake
activity
was
 switched Correct subject-verb agreement
were
by
 Change preposition
to
the 
computer technology.
Correct article usage
apply
Firstly
, the typical of working in 1980 had Linking Words
connection
 with the telephone at 30 %, paper documents at 20 %, meetings at 19 %, Add an article
a connection
face to face
 communication at 14 %, and others Add a hyphen
face-to-face
to 
do list. Fix the infinitive
apply
Moreover
, the Linking Words
stuffs
 had Change the wording
stuff
kinds of stuff
pieces of stuff
Correct article usage
a
the
 different pattern in 2000, Correct article usage
a
such
 as the automation sectors mostly Linking Words
Wrong verb form
needing
needed
 Wrong verb form
needing
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apply
the 
computation devices and paperless. Correct article usage
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On the other hand
, the Linking Words
person to person
 meeting decreased in the percentages.
In conclusion, the world of Add a hyphen
person-to-person
labourer
 has expanded in the multiple tasks because the enforcement of the industry demands Fix the agreement mistake
labourers
the 
speed and more productivity.Correct article usage
apply