The two line graphs illustrate the percentage of families owning electrical appliances and the amount of hours one household spent on doing housework in a country over the period of 99 years, from 1920 to 2019. Overall, the proportion of households with washing machine, refrigerators, and vacuum cleaners tended to increase; while the number of time doing household per family declined noticeably.
While over the time, the percent of families getting electrical household appliances rose, the rate of that trend varied among the three types of machines. Although in 1920, washing machine was the most common electrical device, its percentage of ownership only increased gradually to 60% and 70% respectively in 1940 and 1960. In fact, the figure slightly dropped two decades later, and once again rose to its top at almost three quarters in 2019. Meanwhile, refrigerator witnessed a boom, as the number once started at zero in 1920 and skyrocketed to the peak at 100% only 60 years later and retained the percentage over the following 39 years. Similarly, vacuum cleaner also gained its popularity, as the proportion rose 20% every two decades, starting from 30% in 1920 and ending at 100% equipped with the appliance, and the figure stayed for the next 19 years in 2019.
The second chart displayed an opposite trend, as the amount of time one family spent on doing housework dropped from 50 hours per week to 20 over the period of 40 years. The next 59 years followed a similar pattern, despite the rate at which the hours declined was more steady, stopping at approximately 10 hours per week in 2019.