These line graphs depict the data on the transformation of responsibility for electrical appliances and the required time duration for doing household activities within a 100-year duration (1920 to 2019).
The first line graph shows that in 1920, 30% of households owned a washing machine, and its number increased gradually to around 75% despite a slight downward trend between 1960 and 2000. In the same year, no one owned a refrigerator, but its proportion steeply jumped to 90% in 1960, then moderately went up to 100% in 1980, after which it remained steady. On the other hand, the vacuum cleaner was owned by 30% initially and moderately grew to 100% in 2000, after which it remained constant.
On the next graph, in 1920, each household required 40 hours per week for doing household works like washing clothes, preparing meals, cleaning, etc., and the duration considerably declined to 12 hours per week by the year 2000. Then, itslowly went down, ending up at 10% in 2019.