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 provided bar chart illustrates the statistics of households in the US based on their annual income for the three distinct years: 2007, 2011, and 2015.

Overall

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, it is evident that the numbers of middle-class and upper-middle-class individuals remained almost steady throughout the given years

,

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;

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the numbers of lower-class, lower-middle-class, and upper-class individuals fluctuated in various ways. It can be observed that the sum of earnings between 50 and 75 thousand dollars stayed roughly the same across all three years, with their figures slightly exceeding 20

million

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.

Similarly

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, the number of people in the upper-middle class, earning between 75 and 100 thousand dollars, did not change significantly over time,

although

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their data were slightly less stable than those of the middle class.

On the other hand

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, the number of lower-class citizens rose from just over 25

million

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to just under 30

million

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between 2007 and 2011,

then

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slightly decreased to around 27

million

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in 2015.

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Moreover

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Moreover,

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a similar pattern was observed for the lower-middle class, with a rise between 2007 and 2011 followed by a decline to 2015, fluctuating near 27

million

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households.

However

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, the number of inhabitants with incomes exceeding 100 thousand dollars plummeted from 2007 to 2011

but

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, but

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then

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surged to over 30

million

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after 2011.