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

The line graph displays the data of five groups of households with different

income

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levels in the years 2007, 2011 and 2015. It can be observed that the

overall

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structure of the

income

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levels did not change much. The number of

houses

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which earned more than 100,000 dollars increased to a relatively large extent in 2015 than in the other two years. The figures for middle-class

houses

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, namely the two groups with an annual

income

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of $50,000 to $74,999 and $75,000 to $99,999 are the most stable ones with minor fluctuations. The former

group

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consisted of slightly more than 20

million

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houses

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while

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there were around 15

million

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houses

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in the latter

group

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. The number of

houses

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in the least-

income

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category rose by 3

million

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from 2007 to 2011 and

then

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almost remained the same in 2015. The same pattern

also

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occurred in the second

last

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group

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. At

last

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, the

group

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on the highest

income

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level saw a drop of roughly 2

million

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houses

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from 30

million

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houses

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but soared to 34

million

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houses

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in 2015.