The provided bar chart illustrates the distribution of households in the US based on their annual income in the years 2007, 2011, and 2015.
Overall, the data shows fluctuations in the number of households across different income brackets over the three years. The $50,000-$74,999 bracket had the highest number of households in 2007, while the $100,000 or more category saw a substantial increase by 2015, surpassing the $75,000-$99,999 bracket.
In 2007, the number of households with an annual income of less than $25,000 was 25 million, which slightly increased to nearly 30 million in 2011 and 2015. Conversely, households in the $50,000-$74,999 bracket showed no significant change over the three years. Furthermore, households with incomes between $25,000-$49,000 and over $100,000 constituted the largest share of the population.
The data reveals that the number of households earning $75,000-$99,999 never exceeded 15 million across the three years. On the other hand, there were consistently nearly 21 million households earning more than $50,000 each year. It is evident that there were moderate fluctuations in the income distribution across different segments of society during 2007, 2011, and 2015.