The given line graphs illustrate separately the percentage of alteration in ownership of electrical household items as well as, how much time people expended on do the chores related to these appliances weekly, in a particular country in a 99-year period.
In summary, what stands out is about the ownership of a refrigerator, which had never been considered as an appliance at homes before the first investigation although it experienced a sharp rise in the next studies. Overall, all of items witnessed an upward trend over the years. On the other hand, the time spent on doing these chores showed a downward trend.
There was no ownership of refrigerator in 1920, which increased significantly to 100% in 1980, and leveled off in the last two studies. In 1920, people who owned vacuum cleaner and washing machine were 30% and 40% respectively. However, having a vacuum cleaner surpassed the washing machine over the years and, they reached 100% and about 85% at the end of the study in turn.
The amount of time spending on these housework items at the first study was 50 hours per week. However, it indicated a moderate decrease to about 15 hours in 1980 and, in the following studies it almost remained stable to about 10 hours.