The bar chart illustrates the number of families by their annual income in millions in the USA in 2007, 2011, and 2015.
Overall, all of the bars experienced upward trends over the period. The bar representing $100,000 or more had the most significant growth, while the bar representing $75,000-$99,999 had the slowest rise in the same period.
As regards the bar representing less than $25,000, it commenced at 25 in 2007 and boomed to nearly 30 in 2011. But the bar slightly reduced in 2015. The bar representing $25,000-$49,999 began at just over 25 in 2007 and climbed to a vertex at 30, decreased to just under 30 in 2011 and 2015, respectively.
If we look at the other bars, the bar representing $50,000-$74,999 started at just over 20 in 2007 and remained stable in 2011 and 2015. The bar representing $75,000-$99,999 commenced at just under 15, followed by an increase to 15 in 2015 with a small decrease in 2011. The bar representing $100,000 and more began at just over 30 in 2007 and had grown to around 35 in 2015. But the bar reduced to around 27.5 in 2011.