The line graphs below compare the proportions of the shift of households owning electrical appliances and average of time spent during housework in households in a country from 1920 to 2019.
Overall, although the percentage of households with electrical appliances was extremely low during the past period, it tended to increase in the following years. By contrast, the number of hours of housework per week, per household, was very high during the first few years and it decreased by the years after, respectively.
The refrigerator had the lowest percentage during 1920 around 0-5% of households used and the percentage increasingly rose between 1920 to 1960 until it reached its peak around 2019. Similarly, vacuum cleaners and washing machines were increasing during 1920-1980, but the washing machine was fluctuating during 1980 before it reached the peak in 2019.
In comparison, the number of hours of housework per week, per household, illustrated a steady reduction over the period. Although it had a peak point around 50 hours per week of housework in 1920, in 2019 it displayed around 10 hours per week. It dropped more than 30 hours per week.