The given bar chart provides information about the number of households in the US over the period of 2007 to 2015. The information is categorised by annual income, and the figures are given in millions. Overall, it can be readily observed that the number of households from different categories remained relatively stable, except for the richest group, which increased significantly.
Generally, it can be apparently seen that a group of families that have a yearly salary of 75000 to 99999 had been the minority in 3 periods, with the figure never exceeding 15 million.
Moreover, it can be observed that a group of the richest people made up the highest proportion. In 2007, the group accounted for 30 million, then slightly decreased to 28 in 2011, before surging to 35 million in 2015.
Second largest group คือ กลุ่มที่รายได้ต่ำกว่า 50000 ซึ่งระกอบไปด้วยสองกลุ่มคือ กลุ้มน้อยกว่า 25000 กับกลุ่มที่ 25000-49999. ทั้งสองกลุ่มมีจำนวนใกล้เคียงกันตลอด 3 periods ที่ 25-30m
The second largest group is the group with the annual salary lower than 50000, which consists of 2 groups: less than 25,000 and 25,000 to 49,000. Both groups had a similar number in three periods at around 25-30 million.