The given line charts offer insights into how the proportion of households owning electrical devices and the number of hours a week that a household spends on doing chores changed in a centurial period, from 1920 to 2019.
Overall, there was an evident increase in the ratio of families that had electrical appliances, noticeably the ascend of refrigerator. Furthermore, a downward trend could be witnessed in the amount of time used for housework.
To begin with, in 1920, 40% of households had washing machine, which established it as the most popular electric appliances. This was followed by vacuum cleaner, at 30%, whereas almost no families owned a fridge. The percentage of households having refrigerator, however, rose significantly and surpassed the figure for vacuum cleaner in 1940, and even that for washing machines 2 to 3 years later with around 65%.
The proportion of the families having refrigerator then reached its peak at 100% in 1960. The same happened to the figure for vacuum cleaner in 20 years later while that for washing machines ended up at only 75% in the end. Regarding the number of hours per week a household spent doing chores, this figure in 1920 was 50 but then plummeted considerably to 20 in a first half period and then moderately decreased to 10 in the end.