The following data represent the total number of U.S. households, the number of households headed by women, and family size from 1960 to 1990. Present these data in a way that reveals any changes in U.S. demographics. What do the data suggest about how a social scientist might look at the problems facing the United States? (Households are given in 1,000s.)

Households Total Headed by Year Households Women Family Size 1960 52,799 4,507 3.33 1970 63,401 5,591 3.14 1975 71,120 7,242 2.94 1980 80,776 8,705 2.76 1985 86,789 10,129 2.69 1987 89,479 10,445 2.66 1988 91,066 10,608 2.64 1989 92,830 10,890 2.62 1990 92,347 10,890 2.63