There was a steady decline in number of households with 6 people from 1970 to 1990, and then there was a steady increase from 1990 to 2020.Overall, between 1970 to 2020, there has been a increase, with 1970 having the highest number of households with 6 people at 3.5 million, and 2020 having roughly 2.8 milliion; 1990 had the lowest at around 2.1 million.