The chart below show the changes in ownership of electrical appliances and amount of time spent doing housework in households in one country between 1920 and 2019.

The first line chart depicts the number of families having three kinds of machines[ UNCLEAR  ] measured by percentages across the 9-year span[ the nine years  ] from 1820 to 2019, [ . The  ] the other line graph compares 99-year data (in families of how much time housework took measured by hours in a family each week in a country.)[ confusing  ]

Looking from an overall perspective,[Overall, ] it is readily clear that the ownership of three electrical appliances had an increasing trend over the[ a  ] period of 1 century, [  ; ] whereas (the data of refrigerators)[ unclear  ] experienced the most considerable jump. In addition, [ the  ] time spent on housework (of a family nose-dived)[ unclear  ] in[  during ] the same period.

Out of the (possess of three kinds of machines)[  unclear ] , the figure of refrigerators was the lowest with 0% in 1920, where [ a  ] dramatic increase of 100% occurred in it until 1980, before the ownership had levelled out by 2019 with 100%. On the one hand, there was an (ascending of 70%)[ unclear  ] in the figure of [ for  ] vacuum cleaners from 30% to 100%, [punctuation error   ] after which it stayed unchanged in [ /during  ] the rest of the time; on the other hand, that of washing machines witnessed a comparably stable rise in general of nearly 25% except a slight drop for 10 years since 1960 from 70% to 65%.

For the hours spent on housework per family, which plummeted to 20 hours from 50 hours smoothly until 1960, since which time it kept hover between 20 hours and 10 hours and finally hit the bottom of 10 hours in 2019.[ lengthy/grammatical errors  ]