The bar chart illustrates the distribution of US households by their annual income across three specific years: 2007, 2011, and 2015. Overall, the data reveals a notable increase in the total number of households over the period, accompanied by a discernible shift towards higher income categories. Specifically, the proportion of households earning $100,000 or more rose considerably, while those in middle-income brackets generally saw a decline. In 2007, households earning between $25,000 and $49,999 constituted the largest group, at approximately 27 million. This figure remained relatively stable in 2011, at just under 30 million, before decreasing to about 28 million by 2015. Similarly, the segment earning $50,000-$74,999 experienced a decline, starting at around 21 million in 2007 and falling steadily to just over 15 million in 2015. The bracket of $75,000-$99,999 also showed a downward trend, from roughly 15 million to 14 million over the eight-year span. In contrast, the lowest income category, "Less than $25,000", maintained a fairly consistent presence, fluctuating around 25 to 29 million households throughout the period. The most striking change was observed in the highest income group, those earning $100,000 or more. Starting at nearly 30 million in 2007, this cohort saw a steady increase, reaching around 27.5 million in 2011 and then surging to almost 35 million households by 2015. This significant rise positioned it as the largest income bracket by the end of the period, surpassing all other categories in terms of household numbers.
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