The bar chart shows the number of households in the US, and clisyfied them by their annual incomes in the period between 2007 and 2015.
Overall, families whose their incomes recorded the highest number in the year 2007 and 2015, leaving the first place to households whose their annual incomes between 25000$ and 49999$ in the year 2011. In contrast, households who their annual incomes between 75000$ and 99999$ recorded the lowest number in all years.
At the beginning, families who gained more than 100000 dollar annually accounted nearly for 29 million to be in the first class, followed by the group 25000 to 49999 dollar with 27 million, less than 25000 at 25 million, 50000 to 74999 at 21 million, and 75000 to 99999 at 14 million.
In 2011, the fsrcond and first groups : between 25000 and 49999, and the group less than 25000 increased significantly, reaching 29 and 28 million respectively. In contrast, the group more than 100000 decreased to 27.5 million.
The third period became with no big changes, the except change recorded by the group more than 100000, which jumped to 33.5 million, to be in the first place, while the group between 75000 and 99999 rose slightly to 15 million.