The chart below shows the number of households in the US by thelr annualincome in 2007,2011 and 2015.

The bar chart

illustrate

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illustrates

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the

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amount

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number

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of Residential units by their yearly earnings in five different ranges in America in the years 2007、2011

and

Punctuation problem

, and

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2015.

Overall

Linking Words

, the number of US

households

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with an annual income of less than $40000 experienced an increase. The

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amount

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number

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of families whose earnings

between

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were between

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$50000 and $74999 was stable . For

households

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that earned $100,000 or more and $75,000–$99,999, their quantity

initially

Linking Words

dropped and

then

Linking Words

rose in 2007、2011 and 2015. In 2007, the

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amount

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number

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of US families with an annual income of less than $25000 and those in the $25000-$40000

ranges

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range

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were 25

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millions

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million

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and 27

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millions

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million

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, respectively. Between 2007 and 2011, each of them saw a

slightly

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slight

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growth,

then

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they decreased

around

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by around

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1 million after four years

ago

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apply

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. Over the period, the general trend of these two was increasing. Meanwhile, for

households

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with an annual income of $100,000 or more and $75,000–$99,999, their quantity

initially

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at about 30

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millions

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million

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and 14.5

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millions

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million

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respectively

which

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, which

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were the largest and lowest among the five ranges .

This

Linking Words

trend of

households

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that earned $100,000 or more was decreased

first

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first,

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then

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increased

at

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to

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33

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millions

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million

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in 2015, with the range of $75,000–$99,999 annually

reached

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reaching

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15

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millions

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million

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. The

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amount

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number

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of families whose earnings between $50000 and $74999

were

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apply

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remained stable at 21

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millions

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million

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in the years 2007、2011

and

Punctuation problem

, and

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2015.