People with college degrees are leaving the state at the highest rate in at least 20 years.

The latest issue of the Oklahoma Economist, a quarterly publication from the Oklahoma City Branch of the Federal Reserve of Kansas City, points out that four of the past five years — 2013, 2015, 2016 and 2017 — have seen the largest net outflow of college graduates since at least 1999.

The net migration includes college graduates of all ages with a bachelor’s degree or higher.