In some countries, more people are becoming interested in finding out about the history of the house or building they live in. What are the reasons for this? How can people research this question?

The first line chart compares the percentages of households which had three electrical appliances and the second one provides information about how many hours

consume

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were consumed

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for

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doing house chores

such

as washing clothes, preparing meals and cleaning from 1920 to 2019.

Overall

, during a century, the figure for using

of

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electrical appliances saw upward trends.

By contrast

, in the same period, people spent less time

for

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doing their house chores. In 1990, the percentage of using

of

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Washing

machine

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machines

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was just over zero,

while

that of Vacuum

cleaner

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cleaners

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and

Refrigerator

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Refrigerators

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stood at 30% and 40 %, respectively. From

this

year until 2019,

using

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the use

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of Washing

machine

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machines

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and Vacuum

cleaner

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cleaners

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experienced a moderate rise and they reached 100%,

whereas

Refrigerator

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Refrigerators

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increased over the first 40 years and

then

decreased by about 10% between 1960 and 1980, after which it rose slightly.

In addition

, in 1920, people spent about 50 hours per week

for

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doing housework and over the entire period, the number of hours decreased by 40.