The line graphs show the correlation between the ownership of common household electrical devices and the duration of housework done by families in a country between 1920 and 2019.
Overall, the possession of electrical items by families in this country significantly increased during the period, and as a result, the duration of their weekly housework requirement declined proportionately.
According to the first graph, refrigerators were a rare commodity in houses in 1920, but their presence soared afterwards. Since 1980, every family in this country owned this device at home. A similar, but much smoother trend can be observed with vacuum cleaners, which were present at only three in ten houses a century ago but are now held by 100% of all homes. Lastly, washing machines were owned by 40% of families in 1920 and reached 70% in just four decades. These days, it has remained just below 80%.
The second line chart indicates a direct correlation between the acquisition of essential household appliances and the duration of work required to be done at home. Household work duration dropped dramatically from a high 50 hours per week in 1920 to a mere 10 hours per week in 2019.