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

The bar chart gives statistics about the number of families in the United States in terms of their yearly income in 2007, 2011, and 2015.

Overall

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, two main tendencies can be observed.

Firstly

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, low-income and wealthy families were predominant with mixed success during the period, and

secondly

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, middle-income residential units were notably smaller than those above. In 2007, the wealthy homes were dominant, with around 30 million people.

Furthermore

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, low-income households were slightly above 25 million. Meanwhile, middle-income groups were half the size of the wealthy category, representing a significantly smaller portion of the population.

This

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figure remained practically the same, with only a marginal difference in 2011, suggesting a relatively stable economic distribution during

this

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period. The most notable change can be seen in 2015, when the total of wealthy dwellings increased to roughly 32 million people, demonstrating a clear upward trend.

In contrast

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, others , like middle-income and economically disadvantaged groups, persisted practically the same, with margins from 200 thousand to 500 thousand in the same year, indicating minimal growth in these categories.