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　　It is indicated in the first line chart how proportions of families with three electrical appliances had changed respectively from 1920 to 2019 in a certain country. To begin with, the percentage of families owning refrigerators increased rapidly from around 0% in 1920 to 100% in 1980, and then stabilized until 2019. The similar trend happened in data of vacuum cleaners, with growing up sharply from 30% to 100% (1920-2000) and thereafter leveling up by 2019. By contrast, the figure of washing machines only rose by 30% (40%-70%) in the first four decades, and in the next 20 years it declined by 10% to 60%, followed by a steady ascent in the last 40 years, finally arriving at around 75% in 2019.

　　How many hours people in this country spent on housework weekly of the same time span is revealed in the second line chart. The number obviously had continuous declines, with decreasing drastically before 1960 from 50 to 20 hours and then dropping slightly by only 10 hours by 2019.

　　In summary, with more and more households owning related electrical appliances, people correspondingly spent less and less time on housework. After 2000, all families had vacuum cleaners and refrigerators, but washing machines were not that popular.