The line graphs illustrate the proportion of household electrical appliances and the number of hours spent on housework per week per household over a ninety-nine-period from 1920 to 2019. Overall, the percentage of households had an upward trend, while the amount of time of each household showed a downward trend over the given period.
To start with, there was a gradual increase by 30 percent from 1920 to 1960 in the usage of the washing machine, then this figure went down slightly to a little more than 60 percent. The year 1980 witnessed a minimal rise to just over 70 percent, which was the lowest among the three appliances. The rate of people using the vacuum cleaner climbed significantly from 30 percent to 90 percent in 1980. After two decades, it continued to grow and reach the peak of 100 percent at the end of the time. It is obvious that the percentage of families having the refrigerator surpassed that of the washing machine and vacuum cleaner and hit the highest point at 100 percent in 1980. This data remained fairly stable at 100 percent between 1980 and 2019, which was the same as the corresponding proportion for the vacuum cleaner.
As can be seen from the second line chart, the amount of time each family spent on housework per week declined considerably from 50 hours in 1920 to 20 hours in 1960. There was a slight drop between 20 percent and 10 percent over the following six decades.