The bar chart delineates the distribution of households in the United States classified by their annual income across the years 2007, 2011, and 2015.
Overall, the data reveals notable fluctuations in household numbers across various income brackets, with those in the highest income categories experiencing significant growth over the observed period.
In 2007, the income category of less than $25,000 hosted the largest number of households at 25 million, followed by the $25,000-$49,999 bracket with 30 million. The $50,000-$74,999 category registered 20 million, while $75,000-$99,999 comprised 15 million households, and the category of $100,000 or more accounted for 10 million households. By 2011, there was a discernible decline in the first three income brackets, with households earning less than $25,000 decreasing to 23 million, those earning $25,000-$49,999 dropping to 28 million, and the $50,000-$74,999 category reducing to 18 million. Conversely, the higher income segments saw growth, with $75,000-$99,999 increasing to 17 million and the $100,000 or more bracket rising to 12 million households.
By 2015, the trend of decline continued for the lower income categories, as households earning less than $25,000 further decreased to 20 million and the $25,000-$49,999 bracket reduced to 25 million. Meanwhile, the $50,000-$74,999 segment remained stable at 18 million. In marked contrast, the number of households earning between $75,000-$99,999 surged to 20 million, while the $100,000 or more category experienced considerable growth, culminating in 25 million households. This data illustrates a significant shift towards higher income levels within the American household demographic over the observed years.