The line charts provide information how much time were spent for working in a house each week and the average of usage of the three kind of voltaic devices in a 100-year period.
Overall, (obviously, generally) each of the three workhouse devices experienced increasing trend to the end of the period. It is clear that the great increasing usage of electrical devices is for refrigerator in a house. However, we can see that, people dedicated less time for housework each 20-year during the period.
Approximately zero percent of the individuals have their own refrigerator in their house, so they have not used it at the beginning of a period. But in the next 20 years of the period, in 1940, they possessed not only refrigerator but also the usage of it became more public and the owners tried to work with it just over 50%. The 2 other tools were used about 35% by people of the country at the beginning, and the average of using them steadily raised to 70% in 1960. While the percentage of working with washing machine shrank to just over than 60% in the 20 years from 1960 to 1980; however, the using of vacuum cleaner was raised to 90% in the same years.
During the period of 100 years, the total time that individuals spent their time for housework decreased from 50 hours per week at first to 10% in 2019. Moreover, in 1920 to 1960, the number of hours that the inhabitants of the country dedicated for doing housework shrank sharply to approximately 20 hours for a week, and it continually decreased to just over 10 hours per week in 2019