More than 4,000 elementary, middle and high schools across Korea have shut their doors as the country’s student population shrinks, new data shows.

According to the Ministry of Education’s latest figures, revealed on Sunday by Rep. Jin Sun-mee of the ruling Democratic Party of Korea, since 1980, 4,008 schools under 17 regional education offices nationwide have closed as of March this year. During the period, the number of enrolled students decreased from 9.9 million to 5.07 million.