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 graph illustrates the

number

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of households that are categorised by annual income in the US has changed from 2007 to 2015. The

number

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of houses whose yearly revenue is less than 25,000

dollars

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, 25,000-49,999

dollars

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and more than 100,000

dollars

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had shown an upward trend. There was a significant increase in the figure of homes which earned more than 100,000

dollars

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a year, from 30

million

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in 2007 to 34

million

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in 2015. After growing from 25 and 27

million

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in 2007 to 29 and 30

million

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in 2011 respectively, the amount of families whose annual salary is less than 25,000

dollars

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and 25,000-49,999

dollars

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recorded a one

million

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decrease.

However

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, there was a constant in the

number

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of homes whose yearly income is 50,000-74,999

dollars

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and 75,000-99,999

dollars

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, respectively at 21

million

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and 14

million

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.

Overall

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, among these eight years, the

number

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of households whose regular salary in a year is more than 100,000

dollars

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has witnessed obvious changes,

while

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there is marginal change in the group which earns 75,000-99,000

dollars

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a year.