In some countries, more and 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? Give reasons for your answer and include any relevant examples from your own knowledge or experience.

The diagrams show the comparison between the growth of the ratio of households with electrical

appliances

and the

time

consumed by

housework

every week. The data is collected from 1920 to 2019. The

first

diagram clearly illustrated the trends of the ownership of 3 kinds of electrical

appliances

, including washing

machine

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machines

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,

refrigerator

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refrigerators

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and vacuum

cleaner

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cleaners

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. In 1920, there was barely any family

had

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that had

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a refrigerator while 40% of families had washing machines and 30% of families had vacuum cleaners. After 60 years of rapid growth, refrigerators had been equipped in every family in 1980. During the same period, the ratio of vacuum

cleaner

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cleaners

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increased much slower and stable, and it reached 100% in 2000. Until 2019, the percentage of

household

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households

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with

washing

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a washing

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machine

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machines

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has never reached 100%, remained at about 65% with the slowest popularization

among

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apply

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during the past century with even a slight decline in 1980. The

second

diagram has only one line recording the tendency of the weekly

time

consumption of

housework

, and it had been significantly reduced in the past 100 years from 50 hours to nearly 10 hours. The relative remarkable drop from 1920 to 1960 may be the result of the rapid popularization of

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the refrigerator

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refrigerator

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refrigerators

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at the same

time

. In conclusion, the opposite trends of ownership of electrical

appliances

and

time

consumption for

housework

on the diagrams reflected a possible relationship between them which the popularization of electrical

appliances

was likely to be

a

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an

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effective way to save

time

for

housework

.