Band 5+: The table below gives statistics about the size of US households over a number of years. Study the information and answer the question. Write a short report for a university lecturer describing the information shown below. Write at least 150 words.

The table provides data on the percentage distribution of number of households in United States in 1970, 1890, and 1990.

Overall, It can be seen that the groups 1 person, 2 person, and 3 person showed an increasing trend, while the groups 4 person and 5 person showed a fluctuating trend. The groups of 6 person and 7 person showed the decreasing trend.

In the first three groups (1 person, 2 person, and 3 person) the one-person households experienced a gradual fall from 3,7% in 1790 to 3,6% in 1890 then rose significantly in 1990 to 24,6%. The two-person households experienced a gradual rise from 7,8% in 1790 to 13,2% in 1890, then rose significantly to 32,2% in 1990. The three-person households experienced a gradual rise from 11,7% in 1790 to 16,7% in 1890, then gradually rose to 17,2% in 1990.

In the second two groups (4 person and 5 person) the four-person households started at 13,9% and grew to 15,1% in 1790 and 1890, followed by a slight decline to 15,6% in the final year. The fifth-person households started at 13,9% and grew to 15,1% in 1790 and 1890, followed by a sharp decline to 6,7% in the final year.