How has the population of Pennsylvania changed?

1790-1820 the population went from 430,000 to 1,000,000.

1850-1880 the population went from 1,000,000 to 4,300,000.

1880-1910 the population went from 4,300,000 to 7,700,000.

1910-1940 the population went from 7,700,000 to 9,900,000.

1940-1970 the population went from 9,900,000 to 11,800,000.

1970-present the population went from 11,800,000 to 12,700,000 as it stands today.