CREATE TABLE table_73910 ("Institution" TEXT, "Location  ( all in Ohio ) " TEXT, "Nickname" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" TEXT, "Joined" FLOAT, "Left" FLOAT, "Current Conference" TEXT)

Which year did enrolled Gambier members leave?
SELECT MIN("Left") FROM table_73910 WHERE "Location (all in Ohio)" = 'Gambier'
SELECT MIN("Left") FROM "table_73910" WHERE "Location (all in Ohio)" = 'Gambier'