The given line graphs depict the proportion of electrical appliances and amount of time spent doing household chores in a given country over a period of a century.
Overall, all three appliances showed upward trends, while number of hours per week doing housework experienced a downward trend over the given period.
In 1920, the number of washing machines stood at 40%, compared to that of vacuum cleaners at -30%, and refrigerators at nearly 0%. After 20 years, they all reached at between 50% and 60% respectively, showing upward trends. The proportion of washing machine continued to grow, reaching at 100% by 1980, after which it remained relatively stable until 2019. In terms of refrigerators and vacuum cleaners, the percentage of refrigerators increased gradually, and peaked at 100% in 2000, whereas the number of vacuum cleaners slightly dropped to 65% in 1980. After that, there was also a moderate rise, reaching over 70% by 2019.
As the percentage of electrical appliances grew, the number of hours for housework decreased. It was 50 hours in 1920, seeing a downward trend continuously, and reached at 10 hours in 2019.