The two line charts illustrate the percentage of families who had three specific electrical equipment and how much time they spent for doing chores in one week, over the course of 99 years. From an overall perspective, it is readily apparent that the percentage of having electrical goods is upward, while the second one experienced decline trend.
To begin with, in 1920, almost none of families had refrigerator; however, it surged dramatically at ninety percent by 1960. Then increased gradually to 100% 1980, and remained by the end of the period. Additionally, vacuum clean went up dramaticly, from 30% in 1920 to 100% in 2000. Furthermore, while washing machine was above others, almost 40 percent, at the first the period, it fluctuated during this years and accounted for just above 70%.
Moving to time individual spent for doing their home duties, it is evident that they allocated much more time (exactly fifty hours in seven days) in 1920. After that, the graph plumed to 20 hours in 1960, followed by decreasing gradually to 10 at the end of the period.