This charts shows about percentage of households with electrical appliances and Number of hour at housework per week, per household between 1920 and 2019.

The first line graph compares the owning rates of electronic appliances in a specific country over a period of 99 years, and the second illustrates how much time was spent doing households per week per household. Overall, it is clear that more and more families were equipped with electronic appliances, and the average hours spent on housework per week decreased dramatically. In 1920, forty percent of families owned a washing machine, while the owning rates of vacuum cleaner were slightly lower, making up 30 percent, whereas a negligible number of households possessed a refrigerator. Around 1942, refrigerator became the most common household device, first overrating washing machine, and kept increasing till 2019. Similarly, vacuum cleaner's owning rates also experience a rise. For washing machine, its holding rates fluctuated, finally reaching nearly 71 percent. In 1920, the average amount of time spent on housework per family per week was about 50 hours. Just 20 years after that, it declined significantly, reaching 20 hours. Finally, the decreasing rates reduced a little bit, and in 2019, every family needed 10 hours to deal with housework every week.