The chart below shows the number of households in the US by their annual income in 2007,2011 and 2015. summarize the information by selecting and reporting the main features, and make comparisions where relevant.

The graph illustrates how many US households earned annually in three particular years: 2007, 2011 and 2015

Overall

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, the gross

income

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of households had increased by 2015. At the same time, the

number

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of communes having low and middle

income

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had only slightly changed. In detail, in 2007, the vast majority of families earned at least $100,000 per year, making up about 30

million

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.

Although

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in 2011 their

number

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decreased to about 27

million

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, in 2015, the

number

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of high-earnings households reached approximately 33

million

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, exceeding previous periods. As regards families having a low gain, their

number

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fluctuated in a gap between 25 and 30

million

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over the present period. The

number

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of communes which had a middle

income

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of $50.000-100.000

,

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was almost stable, accounting for around 21

million

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in the case of $50,000-75,000 dollars

income

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and almost 15

million

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those who earned less than $100,000.