The U.S. population grew in the past year at its slowest rate in over eight decades, with growth in the South and West continuing to outpace the Northeast and Midwest, according to figures the Census Bureau released Wednesday.

The numbers, which cover the year ended July 1, show the country’s population rose by 0.6% to 327.2 million people. That was the lowest rate since 1937 in data going back to 1901, according to William Frey, a demographer at the Brookings Institution.