The bar chart illustrates the number of households in the United States categorized by their annual income for the year 2007, 2011, and 2015. The income brackets are divided into 5 groups ranging from less than $25,000 to over $100,000.
In the big picture, the data showed a clear trend of increasing income levels among US households over the period. In 2007, the largest group of households, approximately 30 million, earned over $100,000 . This was closely followed by households earning between $25,000 and $49,999, numbering around 27 millions. Households with income less than $25,000, and those with $50,000 and $74,999, were fewer, coming at around 25 million and 20 million. The smallest group, comprising around almost 15 million households, earned $75,000 and $99,999.
By 2011, there was a noticeable shift. Households earning $25,000 and $49,999 increased to almost 29 millions, while the $100,000 bracket decreased to around 27 millions. Meanwhile, the number of others is still the same.
In 2015, the trend continued with a marked increase in higher income households. The number of households earning less $25,000 and earning between $25,000 and $49,999 slightly decreased. The two highest income brackets both increased, especially households who earned $100,000 or more surged to around 33 millions, making it the largest income group in 2015.
Overall, the data reveals a noticeable trend of increasing income levels among US households over the 8 years period. The number of households in the highest income bracket saw substantial growth, while the number of households in the lower bracket generally declined or remained stable.