there are different households with different incomes through the years of 2007, 2011 and 2015. there are almost 35 million households considered for this data.
for the overall look, there are no so many dramatic changes even though the gap between the years are big. it seems like the lowest number of households is the ones that gains around 75,000 and 99,999 annually. and the other ones who has highest number is the ones that has more than 100,000 dollars income with the number of between 30 and 35 million.
in 2007, 25 million people had less than 25,000 dollars income while the ones that gain around 25,000 and 49,999 are slightly more people. there are also households that gets between 50,000 and 74,999 which is 20 million households. nearly 5 millions less than this one gets around 75,000 and 99,999, but the biggest number of people which is almost 30 million had more than 100,000 dollars as their income.
in 2011, the number of households that gains less than 25,000 and around 25,000 and 49,999 increased up to almost 30 million while the number of the other households that had between 50,000 and 74,999 stayed the same. also, people that has their income around 75,000 and 99,999 slightly decreased and the households that had their income more than 100,000 had the same effect at the same time.
in 2015, the ones that had less than 25,000 , around 50,000 and 74,999 stayed the same while others had small changes. but the ones that had 100,000 dollars as their income inceased dramatically up to almost 35 million households.