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 gave data regarding the American household units (in

millions

) in the years 2007, 2011, and 2015. Each year's data was divided into five groups

according to

yearly income bands. The

overall

proportion of each income band remained roughly unchanged in these 3 years,

while

only the number of families earning more than 1

million

dollars, exceeded 30

million

in 2015. Looking at the first two bars from the left , the two branches of household with annual salaries of less than or equal to $49999 changed with the same pattern in 3 years, both increasing by more than 2.5

million

in 2011, before falling again in 2015. The third bar represented the number of families who earned a salary between $50000 and $74999, and its height remained constant at the 21

million

line.

In contrast

, households in branches of outweighing and equaling 1

million

dollars reduced by around 2.5

millions

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million

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, falling down from 29

millions

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million

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in 2007 to 27

millions

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million

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in 2011, and went up to approximately 33

millions

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million

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in 2015. The figures

of

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for

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households with annual salaries between $75000 and $99999 followed the same changing pattern, slightly fluctuating around 15

millions

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million

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.