The provided line charts illustrate the changes in ownership of electrical appliances such as washing machines, refrigerators, and vacuum cleaner, and the amount of time spent doing housework from 1920 to 2019.
Overall, all three appliances experienced an upward trend in using them through the end of the period, while there was a steady decrease in the number of hours of housework per week. The most significant increase was for refrigerator usage in households.
In 1920, the washing machine started with 40% of households, which was the highest level of use compared to other appliances in that year; then it approximately doubled in 2019. Similarly, vacuum cleaner increased from 30% to 100% and then leveled off until the end of period. Refrigerator usage was 0% in the 1920, the lowest level of usage, then at sharply increased up to 100 in over the 80 years and then reached the plateau.
Although the number of housework per week per household was started with 50 hours peer week in 1920, it slowly decreased to 10 hours in 2019, which meant that more usage of electrical appliances leads to less housework.