the chart below shows the number of houesholds in the us by thier annual income in 2007 , 2011 and 2015

The bar chart illustrates the figures of

households

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in the United States by their annual income in 2007, 2011 and 2015. Units are measured in millions.

Overall

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,

it is clear that

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the number of high-income

households

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fluctuated , and the lower-income group increased and

then

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remained stable. Whilst all the other income groups remain unchanged over the time period. In 2007, the number of less than $25,000 and $25,000-$49,000 was nearly 25

million

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, which slightly increased by 2% in 2015 and recorded 27

million

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. The number of

households

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with incomes ranging between $50,000-$74,999 was 21

million

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in the first year, and did not change in 2011 and 2015. The figure of

households

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in the

last

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second group of $75,000-$99,000 was around 15

million

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in 2007, and a minimal decrease of 0.1% was noticed in 2011,

then

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again surged to 15

million

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in 2015. Whilst

,

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apply

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the highest income group followed the same trend, which was 29

million

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in 2007, declined by 2

million

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in the middle year, and increased to over 30

million

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in 2015.