The chart belows 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 illustrates the total of US households in four varieties of incomes per

year

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with four-

year

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intervals from 2007 to 2015. The unit on the Y-axis is shown in millions.

Overall

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,

it is clear that

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the trajectory of the first four groups (less than $100,000) remains the same throughout the period

while

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the

last

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group

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is varying.

To begin

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with, the citizens, who

got

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had

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annual incomes less than $25,000 in 2007, were exactly 25 before shot up to nearly 29 in 2011

then

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slightly fell to 28 in the

last

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year

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. The second

group

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with a salary per

year

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around

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of around

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$25,000-$49,000 was at approximately 27 in the first

year

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and escalated to well over 30 in the next four years,

furthermore

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, it minimally dropped by 1 in 2015.

Additionally

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, The third

group

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, with annual earnings at $50,000-$74,999, stayed constant throughout the recording period. The $75,000-$99,999

group

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started at just under 15 and fluctuated to exactly 15 in 2015.

Besides

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, the

last

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group

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, with more than $100,000 annual income, began at almost 30. The gradual decrease was seen in 2011 to roughly 28 and ,in 2015, it surged to 34.