The given chart illustrates number of households in the US by their annual income in 2007, 2011 and 2015.
Overall, number of income for three years, given years, most of people income more than 100,000 dollars; while, always smallest proportion of income for households who income in between 75,000 and 99,999. People who salary between 25,000 and 49,999, in the second in following years.
With regard to the chart, in 2007 households income more than 100,000 dollars in the first year by 30 million number of households; Additionally, households earned between 75,000 and 99,999 shared smallest number of households in 2007 which is around 15 million.
In contrast, in 2011, households income from more than 100,000 fall mildly from 30 to around 26 million, while people who income between 25,000 to 49,999 and less than 25,000 increased moderately to above 25 million. However, in 2015, all categories stay unchanged but number of households who income more than 100,000 increased sharply from 25 to approximately 35 in 2015