The upper chart displays the changes
of
percentages of households with three kinds of large-size electrical appliances over a century and the lower one shows the changes in hours spent on housework every Change preposition
in
week
with the same Use synonyms
time
interval as the Use synonyms
last
one.
It is obvious that the Linking Words
time
it takes to do housework kept drastically decreasing from 1920 to 1980 as the percentage of Use synonyms
houses
equipped with Use synonyms
refrigerators
and vacuum cleaners were all climbing up in the same period of Use synonyms
time
.
The Use synonyms
refrigerators
have been the most popular household electrical appliance ever since 1920 when its ownership was zero. Meanwhile, the washing machines and the vacuum cleaners had been installed in 40% and 30% of the Use synonyms
houses
, respectively. The percentage of installation of Use synonyms
refrigerators
was always rising until 1980 when the figure was 100% and remained unchanged for the next 40 years. A similar pattern took place in the ownership of vacuum cleaners but the peak showed up 20 years later than that of Use synonyms
refrigerators
in 2000. The washing machines were installed in 70% of Use synonyms
houses
in 1960. Use synonyms
However
, it didn't become more popular since Linking Words
then
.
With more electrical appliances deployed, the Linking Words
time
people spent washing clothes, preparing meals and cleaning the Use synonyms
houses
every Use synonyms
week
became less and less. In 1920, it took people 50 hours per Use synonyms
week
to finish the above housework. With the aid of electrical appliances, the figure had been significantly reduced to only 10 hours a Use synonyms
week
.Use synonyms
micilan