The provided bar graph illustrates the distribution of households in the United States based on their annual income for the years 2007, 2011, and 2015.
Overall, the analysis shows fluctuations in the number of households earning different income levels over the specified time periods. While households with incomes less than $25,000 experienced an increase in 2011 followed by a slight decline in 2015, those earning $100,000 or more saw a decrease in 2011 and a subsequent rise in 2015.
In 2007, approximately 25 million households had an annual income below $25,000. This figure increased to around 28 million in 2011 but decreased to approximately 27 million by 2015. The number of households earning between $25,000 and $49,999 was about 26 million in 2007, peaked at around 28 million in 2011, and then dropped to roughly 26 million by 2015. In the income category of $50,000–$74,999, the number of households remained stable at 21 million throughout the years 2007 to 2015.
Moving to households with incomes ranging from $75,000 to $99,999, there was a slight decrease of around 1 million households from 2007 to 2011, reaching a value of 14 million, before increasing to 15 million by 2015. The highest income bracket, households earning $100,000 or more, consisted of approximately 29 million households in 2007. This number declined by roughly 2 million in 2011 but substantially increased to about 32 million by 2015.