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

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

number

of houses whose yearly revenue is less than 25,000

dollars

, 25,000-49,999

dollars

and more than 100,000

dollars

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

dollars

a year, from 30

million

in 2007 to 34

million

in 2015. After growing from 25 and 27

million

in 2007 to 29 and 30

million

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

dollars

and 25,000-49,999

dollars

recorded a one

million

decrease.

However

, there was a constant in the

number

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

dollars

and 75,000-99,999

dollars

, respectively at 21

million

and 14

million

.

Overall

, among these eight years, the

number

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

dollars

has witnessed obvious changes,

while

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

dollars

a year.