The table given represents information about US families in three centuries from 1790 to 1990.
Overall, it is evident that the average population per household was reduced by half during the period mentioned in the USA.
To begin with the first century, seven person families established the greatest figure with almost one third 35.8% while it was 3.7% for one person families.The average member families were five, four and three people with 13.9% for the first two and 11.7% for the last mentioned respectively.
Moving to the second century (1890), a more balanced spreading is observed. While single- person families have more or less stayed the same, two-person families have doubled, three, four and five have grown a little and six and seven-member families have fallen slightly with nearly 2 and 12 percent in the order stated.
Finally in 1990 with the average 2.6 average population per household, two-person families accounted for the largest group with roughly a third percent followed by single-man households with 24.6%. At the lowest rank of the table, sit the two groups of six and seven-person families with 2.3% and 1.4%.