The provided bar chart illustrates the number of U.S. households by annual income in 2007, 2011, and 2015. The information is presented in millions.
Looking from an overall perspective, it can be clearly seen that $100,000 or more was the largest income group in 2007 and 2015, while $75,000-$99,999 was the smallest in every period.
According to the bar chart, the highest number belonged to the wealthiest families in 2007 and 2015, at almost 30 and over 33 million families, respectively. However, the $25,000-$49,999 was the highest income section in 2011. Households that earned $75,000-$99,999 comprised the lowest number, which never exceeded 15 million, throughout the given periods.
Furthermore, the $50,000-$74,999 category remained relatively stable from 2007 to 2015, at 22 million. 25 million of US households got less than $25,000 in 2007, but the number slightly increased in 2011.
