The provided chat depicts information about yearly revenue of many households in the USA from 2007 to 2015. They are categorised by their annual income and divided into five groups, namely families with annul profit less than $25,000 (Group A), $25,000-$49,999 (Group B), $50,000-$74,999 (Group D), $75,000-$99,999 (Group D), and $100,000 (Group E).
On the whole, it is evident that Group A and B showed an upward, while Group E experienced a downward trend throughout the given period except the final year, and Group C and D almost remained steady over the period.
To begin with, regrading the families yearly income, obviously Group B had more annual earning than Group A, with around 27 millions, compared to exactly 25 millions in 2007. These two figures then witnessed a slight rise by approximately 8 and 10 millions respectively in 2011; however, Group A and B came down minimally in the year of 2015.
Meanwhile, in 2007 Group E stood at the highest profit at just under 30 millions, but there was a slight decline of almost 4 millions after 5 years; on the other hand, this figure reached its peak at about a third millions, whereas Group C and D remained unchanged for nearly a fifth and almost 15 millions.