The bar chart shows the number of households in the US by their annual income in 2007, 2011 and 2015.

The bar graph compares the total of

families

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in five different income levels in 2007, 2011, and 2015. In general, the number of

families

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in all income levels increased gradually over the period, despite one category remained unchanged. In detail, houses in the range of $100,000 or more, which is the majority of the population, had experienced an upward from almost 30

million

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in 2007 to over 32

million

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in 2015, except for a small dip in 2011.

Likewise

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, the number of

families

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with salaries less than $25,000 rose gradually from 25

million

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to around 27

million

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in the same period.

On the other hand

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,

families

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with an income level of $25,000-$49,999 had increased steadily from around 26

million

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in 2007 to almost 30

million

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in 2015.

Similarly

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,

families

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in the range of $75,000-$99,999, which is the smallest population, rose steadily to 15

million

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in the same year.

However

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,

while

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the other four categories had increased,

families

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with the range of $50,000-$74,999 stayed constant at around 21

million

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during the periods