97.7% of the population were in households, 2.3% were in group quarters, and 1% were institutionalized. There were 8,103,731 households of which 30.2% or 2,449,343 had children. 46.1% or 3,736,165 were composed of opposite sex and married couples. Male households with no wife composed 4.9% or 400,534. 15.0% or 1,212,436 were female households, with no husbands. 34% or 2,754,596 were non-family households. The household density was 684 per square mile. 91.9% of housing units were occupied with a 3.8% vacancy rate. The average household size was 2.65 per household. The average income for non-family households was $90,335, and the average income for families was $104,715. 13.3% or 2,888,493 of the population were below the poverty line.. How many more dollars are the average income for families than for non-family?