The bar chart below illustrates the households in the American by their annual income in 2007, 2011, and 2015. Overall, the number of households were slight increase by the end of 2015 in the period, but their income were stable in the three-year.
In addition, in 2015 the servants were more than 2007, and almost like 2011.
In 2007, who take less than $25, 000 were 25 million, but who take between $75, 000 and almost $100, 000 were the lowest, they were approximately 13 million, and the highest income take $100, 000 or more, they were the highest number of households. While in 2011, the most households numbers were around 27 million, but the least were the same in 2007, who take $75, 000 to $99, 999.
In contrast, in 2015, the servants who take less than 25, 000 or between 25, 000 and 49, 999 were the same number. Their income between $50, 000 and $74, 999 were about the same number in the three-year they were 20 million.