The dual line charts show the diffusion rate of the three types of electrical appliances, washing machine, refrigerator and vacuum cleaner, and the number of hours which households spent per week.
Additionally
, the data were from 1920 to 2019.
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Overall
, as more people obtained those technologies, they became less likely to use their own time for housework. Linking Words
Moreover
, citizens were less likely to prefer washing machines to the other two types of appliances.
Specifically, focusing on the chart above, Linking Words
although
the percentage of refrigerators was the lowest in 1920, below 10%, it exceeded the other categories around 1950 and reached 100% in 1980. Linking Words
On the other hand
, that of vacuum cleaners was 30% and became 100% in 2000. Linking Words
This
indicates that even though the refrigerator was the least popular product at the beginning, its popularity significantly surged because Linking Words
this
category reached the ceiling at first. Linking Words
However
, Linking Words
while
the figure for washing machines was the highest in 1920, it could not achieve the maximum score even in 2019 and the rank of Linking Words
this
technology became the lowest, Linking Words
as a result
.
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On the other hand
, as the chart below displays, the number of hours which people spent on housework was 50 in 1920 and sharply declined to 20 in 1960, and that figure Linking Words
consequently
fell to 10 in 2019.
In comparison, the biggest growth rate among the three types of technologies was observed in the case of refrigerators as the proportion increased by about 95 percentage points over 99 years.Linking Words
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