The line graphs give information about how much time people spent doing housework and the percentage of families with washing machines, refrigerators and vacuum cleaners between 1920 and 2019.
Overall, sharp increase in household appliances led to a significant decline in time spent doing housework. It is noticeable that after the percentages of devices plateaued, the same happened to the number of housework hours.
From 1920 to 1960 the percentages of owning household appliances skyrocketed. The most significant rate increase experienced refrigerators from just around 5% to as much as 90% by 1960, making it the most common household gadget among these three. As for washing machines and vacuum cleaners, they constituted 40% and 30% at the beginning of the period, respectively. Despite a 10% gap between them, they both reached the same 70% by 1960. These growths in ownership of household technologies reduced the number of hours spent on housework from 50 to 20 hours per week between 1920 and 1960.
After 1960, the percentage of families with refrigerators and vacuum cleaners increased steadily to 100% by 2019. Meanwhile, the percentage for washing machines flattened out at around 70-75%. These changes led to gradual decrease of time spent doing housework from 20 in 1960 to just above 10 hours per week in 2019.