The line graphs illustrate data about 
hte
 percentage of households (Correct your spelling
the
washin
 Correct your spelling
washing
machine
, Fix the agreement mistake
machines
refrigirator
, Correct your spelling
refrigerator
vacum
 Correct your spelling
vacuum
cleaner
) Fix the agreement mistake
cleaners
spend
 on Wrong verb form
spent
this
 per week, over a 99-year Linking Words
period
 between 1920 and 2019. 
Use synonyms
Overall
, what stands out from the chart is that amount of time per week became lower Linking Words
at the 
Linking Words
end
 of the Use synonyms
period
. Another interesting finding is that Use synonyms
refrigirator
 showed a significant increase over a Correct your spelling
refrigerators
period
. 
As regards the details, people spending time Use synonyms
started
 at 50 hours per week in 1920 and Change the form of the verb
starting
then
 it slightly decreased by Linking Words
aproximately
 15 hours in 1980. Having Correct your spelling
approximately
leveled
 off until 2000, the Change the spelling
levelled
figure
 Use synonyms
then
 fell slowly Linking Words
at the 
Linking Words
end
 of the Use synonyms
period
. 
Use synonyms
By contrast
, in terms of Linking Words
refrigirator
, there was a sharp incline from 1920 Correct your spelling
refrigerator
intil
 1960 the figures as 0% and Correct your spelling
until
then
 Linking Words
it
 became 90%. After that, it was a slight increase, after which the Correct pronoun usage
they
figure
 Use synonyms
remaind
 stable at 100%in 1980  and until 2000. Correct your spelling
remained
remains
However
, Linking Words
a
 washing machine showed a Correct article usage
the
flactuation
, it went up slightly, Correct your spelling
fluctuation
at
 40% compared to 70% from 1920 until 1960, the Change preposition
to
figure
 Use synonyms
then
 went down gradually to Linking Words
arround
 65%. After falling it slowly increased Correct your spelling
around
at the 
Linking Words
end
 of the Use synonyms
period
.
Regarding Use synonyms
vacum
 Correct your spelling
vacuum
cleaner
, the Fix the agreement mistake
cleaners
electic
 appliance went up gradually over Correct your spelling
electric
eclectic
a
 80-year Change the article
an
period
, Use synonyms
started
 at 30% and Wrong verb form
starting
Use synonyms
end
 up at 100% the Wrong verb form
ending
figure
 Use synonyms
then
 Linking Words
leveled
 Change the spelling
levelled
of
 at a peak Replace the word
off
until
 2019.Change preposition
in