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, andmake comparisons where relevant.

The bar graph provides information on the volume of the American population by their annual income in the three time periods (2007,2011, and 2015).

Overall

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, the average income of people in the United States showed an increase by the end of the period, despite some changes in the numbers allocated to most of the categories. In terms of the numbers of individuals who earned between $50,000 and $74,999 and whose earnings are over $75,000 but less than $10,000 , they stayed relatively constant throughout the periods (just over 20

million

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and nearly 15

million

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, respectively).

However

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, the population whose salary is more than $99,999 experienced

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significant growth, from approximately 30

million

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in 2007 to around 33

million

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in 2015. The figure of US residents whose wage is under $50,000 generally rose by about 4

million

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in 2011, which decreased by almost 2

million

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at the end

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of the period.