รายละเอียดตัวอย่าง

The chart describes the number of households in US through their yearly annual income in 2007, 2011 and 2015. Overall, the group of $100,000 or more led the chart, after that was $25,000–$49,999. Likewise, the group of less than $25,000. Likewise, the annual income group of $50,000–$74,999 witnessed a fluctuation but remained stable. Firstly, the number of households whose yearly income were $100,000 or more accounted for nearly 30 millions in 2007 and reached its peak at over 30 millions in 2015. The group of $25,000–$49,999 witnessed a fluctuation, which was an increase slightly from above 25 millions in 2007 to nearly 30 millions in 2011 and a small decrease to about 26 millions in 2015. In addition, the group of annual money less than $25,000 started at 25 millions, reached its peak by above 28 millions in 2011 and slightly decreased between 2007 and 2015. On the other hand, the others did not see a noticeable change. In 2007, there were about over 20 million households who earned $50,000–$74,999 a year, and it stayed almost unchanged during the period. The corresponding figures for the annual income of $75,000–$99,999 started at near about 15 millions and increased to 15 million.