The bar chart illustrates that the number of household in the United State, categorized by their annual income levels in the years of 2007, 2011 and 2015.
Overall, the number of households who earning $100,000 or more rose steadily across the period, while those with incomes below $25,000 showed a gradual decline. Meanwhile, the middle income groups fluctuated slightly but remained relatively stable compared to the highest and lowest brackets.
In 2007, households earning less than $25,000 accounted for just under 30 million, but this figure gradually decreased to around 27 million by 2015 . Similarly, the $25,000 ~ $49,999 group declined slightly from about 30 million in 2007 to around 28 million in 2015. In contrast the number of household with an annual income of $10,000 or more increased consistently, reaching approximately 33 million in 2015, the highest among all groups.
As for the middle ranges , households earning between $50,000 and $74,999 fluctuate only marginally, hovering around 20 million in each of the three years. Those in the $75,000-$99,999 bracket remained stable at about 15 million, showing almost no significant change.
To summarize, while lower income households became less common, the proportion of wealthier households grew, reflecting a gradual upward shift in income distribution in the US during the period of the time.