The bar chart shows the number of households in the US by their annual income in 2007, 2011 and 2015.

The bar graph compares the total of

families

in five different income levels in 2007, 2011, and 2015. In general, the number of

families

in all income levels increased gradually over the period, despite one category remained unchanged. In detail, houses in the range of $100,000 or more, which is the majority of the population, had experienced an upward from almost 30

million

in 2007 to over 32

million

in 2015, except for a small dip in 2011.

Likewise

, the number of

families

with salaries less than $25,000 rose gradually from 25

million

to around 27

million

in the same period.

On the other hand

,

families

with an income level of $25,000-$49,999 had increased steadily from around 26

million

in 2007 to almost 30

million

in 2015.

Similarly

,

families

in the range of $75,000-$99,999, which is the smallest population, rose steadily to 15

million

in the same year.

However

,

while

the other four categories had increased,

families

with the range of $50,000-$74,999 stayed constant at around 21

million

during the periods