The given bar chart gives date on the income rate among different households in the US area of the provided period between 2007 and 2015
A glance at the graph reveals that these individuals separated into 2 group in terms of stability and volatility, that led to the replacement of the highest proportion
Firstly, between 2004 and 2007, the two groups owned incomes ranging from 50 thousand dollars to just under 100 thousand dollars that stayed unchanged for 4 years with rates of around 21 and 15 million, respectively. While the three remaining groups witnessed a massive change with the top place was the household with 25 thousand to 49,999 dollars in 2011 instead of the highest income one in 2007. In turn, this situation resulted in the considerable fall of the highest income type from nearly 30 million to approximately 27 million and the significant soar of the first two groups, with 3 million households per kind.
To continue from 2007 to 2015, one of the most noticeable changes is the dramatic rise of the highest-standard households, which is about 5 million through 8 years. In contrast, the remaining kinds have been stable through the years, with the number of each type was about 27, 28, 21 and exactly 15 million, respectively.