The bar chart illustrates the number of American families by the amount of annual income in 2007, 2011 and 2015.

The bar chart illustrates the number of American

families

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by the amount of annual

income

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in 2007, 2011 and 2015. It is noticeable that the

numbers

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of the highest-

income

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families

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and low-

income

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households were constantly higher than the figures for the medium-

level

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group in the three given years.

Moreover

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, the former

income

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groups saw an

overall

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rise in

numbers

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from 2007 to 2015,

while

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the latter remained stable during the same period. The number of households whose annual incomes exceeded 100000

dollars

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was nearly 29

million

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in 2007, and it increased to around 33

million

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in 2015 after a slight fall in 2011.

By contrast

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, the

numbers

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of US

families

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with an

income

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level

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of 50000 to 74999

dollars

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and a higher

level

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of 75000 to 99999

dollars

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remained almost unchanged, with the figures being about 21

million

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and nearly 15

million

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in the three years. In terms of the lower

level

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of annual household

income

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in the US, the

numbers

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of

families

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with an

income

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level

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of 25000 to 49999

dollars

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and less than 25000

dollars

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recorded a similar trend over the 8 years, with an increase of around 4

million

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from 2007 to 2011 and a decline of about 1

million

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from 2011 to 2015.