The data provides a bar chart that compares US households by their annual income in three different years, from 2007, 2011, to 2015.
Overall, the comparison of data in 2007, 2011, and 2015 shows no drastic change in proportion between the five groups of US households categorised by their annual income. The category of US hoseholds with the most significant shift in number was the highest annual income category, while the lower income categories remained considerably similar in number over the years.
On one hand, the group of US households with the most annual income ($100,000 or more) experienced a fluctuation in number. There was a slight decrease from around 30 millions to 27,5 millions US households being in this category in 2011. However, the number jumped with almost 35 millions US households are in this category in 2015.
On the other hand, the lower groups of annual income of US households (less than $25,000 to $99,999) only changed slightly in number over the years. The first and second groups of US households with less than $25,000 to $49,999 of annual income rose about 5 millions in number in 2011, then experienced a little decrease in 2015. The third and fourth group of US households with $50,00 to $99,999 of annual income held similar number of households over the three years, with only about 1 millions more of US households became categorised in the $75,000 to $99,999 group of annual income.