The charts below show the changes in ownership of electrical appliances and amount of time spent doing housework in household in one country between 1920 and 2019. Summarise the information by selecting the relevant and main features and make comparisons where relevant.

The upper chart displays the changes

of

Change preposition

in

show examples

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

week

with the same

time

interval as the

last

one. It is obvious that the

time

it takes to do housework kept drastically decreasing from 1920 to 1980 as the percentage of

houses

equipped with

refrigerators

and vacuum cleaners were all climbing up in the same period of

time

. The

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

houses

, respectively. The percentage of installation of

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

refrigerators

in 2000. The washing machines were installed in 70% of

houses

in 1960.

However

, it didn't become more popular since

then

. With more electrical appliances deployed, the

time

people spent washing clothes, preparing meals and cleaning the

houses

every

week

became less and less. In 1920, it took people 50 hours per

week

to finish the above housework. With the aid of electrical appliances, the figure had been significantly reduced to only 10 hours a

week

.