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, and make comparisons where relevant.

The bar chart compares the number of families with their yearly

income

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in 2007, 2011, and 2015, separated into five ranges.

Overall

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, the annual

income

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of US families increased slightly from 2007 to 2015. Households with $10,000 or more

income

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accounted for the largest proportion,

while

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those with $ 75,000–$99,999

income

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were the least significant. In both 2007 and 2015, the most significant figure was $100,000 or more (about 30

million

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and 33

million

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, respectively), followed by $25,000~$49,999 (about 27

million

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).

Besides

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, people with less than $25,000 were the third most common type, followed by $50,000~$74,999, with a large gap between the two.

In contrast

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, $ 75,000–$99,999 had the lowest share, at about 15

million

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over the three years. In 2011, the number followed a similar trend to the other two years, with $25,000~$49,999 accounting for the largest share, and a slight gap between

income

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less than $25,000.