The graph is a line chart titled, “Share of Metal Manufacturing Employment in Industries with High CNC Exposure.” The y-axis ranges from 15 to 50 percent, and plots employment shares for both college and high school graduates. The x-axis spans the years 1968 to 2017. In 1968, the college graduate employment share was 20.2 percent, and increased to 53.2 percent by 2017. The high school graduate employment share was 38.6 percent in 1968, and decreased to 19.3 percent by 2017. Source: Researchers' calculations using data from the CPS Annual Social and Economic Supplement