The bar chart illustrates the quantity of families in the USA by their early income in 3 different years(2007, 2011, 2015). The housefolds were divided into 5 groups depending on their income.
Overall, there was a slight increase in numbers for families who earn less than 50,000 dollars, as well as for those who receive more than 100,000 dollars annually. The figures for between 50,000 and 100,000 remained the same over the period.
Families with less than 25000 in their income was accounted for 25 million people in 2007, and incresed gradually in 2011 at around 27 million, before leveling off in 2015. The numbers between 25000 and 50000 dollars increased from 27 to 29 millions in 2011, Those who earn more that 100, 000 dollars were about 28 million in the first year. It reached a peak of 33 million families in 2015, despite the slight drop in 2011.
Households that received between 50,000-75,000 dollars and 75000-10000 dollars approximately remained the same in numbers over the the timeframe, standing at around 22 million and 29 million respectively.