The chart below shows the number of households in the US by their annual income in 2007, 2011 and 2015. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The given bar chart illustrates the classification of households' annual revenues in three classes and demonstrates the

population

in millions regarding the classification in the United States in 2007,2011 and 2015. As an overview, the significant feature that can be seen from

this

chart is that the number of households with $100,000 or more annual

income

increased massively from 2007 to 2015.

Also

, the

population

of households with $50000 to $74999 yearly

income

remains steady over

this

8-year period. As it can be observable,

however

, the highest

income

category and the annual

income

of $75K to $99.99K experienced a negligible decline from 2007 to 20011 and reached approximately 27

million

and 14

million

respectively, the figure for them both shows the rise in

population

which was noticeable for the highest

income

group

with close to 33

million

population

and was negligible for another

group

with 15

million

of

householders

.

On the other hand

, both the number of

householders

in the least annual remuneration

group

and the $25K to $49.99K

group

became more in 2011 and achieved roughly 27 and 30

million

householders

that year.

In contrast

, both of these groups experienced a small decline in 2015 with a decrease of nearly 1

million

of their populations.

Furthermore

, the number of

householders

with $50K to $74.99K annual revenue remains steady in

this

given time period.