The bar graph gives information about the number of households in 2007, 2011 and 2015 in the United States, classified according to their total annual income.
Overall, both the lowest and highest income group grew over the eight year period, whereas middle income categories showed little change. By 2015, households earning more than $100,000 represented the largest growth, recording the most significant increase of all brackets.
Firstly, focusing on the ranges that expanded, it can be seen increases at both ends of the scale. At the upper end, households with annual income above $100,000 represented the most substantial growth, rising from just under 30 million in 2007 to around 34 million in 2015, despite a dip to 27 million in 2011. A similar upward trend occurred in the lower end of the graph, where those with less than $25,000 income, growing from 25 million in 2007 to just below 30 million in 2011, before falling slightly to around 27 million in 2015.
In regard to the middle-income categories, comparative less variation was observed. The units with annual earning between $25,000 – $45,999 increase slightly from about 26 million to 30 million in the first four years, before slipped back to roughly 28 million in 2015. Those in the $50,000 – $74,999 range accounted for just above 20 million throughout the entire period, while the $75,000 – $99,999 bracket consistently represented the smallest group, remaining at just under 15 million in 2007 and 2011, and edging up to reach 15 million in 2015.