The charts below show the changes in ownership of electrical appliances and amount of time spent doing housework in hoseholds in one country between 1920 and 2019.

The line graphs below illustrate the number of electrical devices owned by families and the number of hours they spent cleaning their houses in an unknown country from 1920 to 2019.

Overall

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, the graphs show a moderate increase in the usage of electrical appliances and a steady decrease in time spent doing housework throughout 99

years

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.

According to

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the first chart, refrigerators' popularity tended to rise upward between 1920 and 1980 and

then

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maintained the same level for the next 39

years

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. The vacuum cleaners experienced the same sharp ascending period for the first 80

years

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and remained at 100% from 2000 to 2019. Despite all three of them showing positive changes in their usage dynamics, the percentage of families using washing machines slowly increased from 40% to 70% and

then

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fluctuated between 65% and 70% for the rest of the

years

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. It is obvious that the number of hours spent cleaning the houses quickly dropped from 50 to 20 hours between 1920 and 1960 and

then

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slowly declined by 10% for the rest 59

years

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on the chart.