CREATE TABLE table_16990 ("Institution" TEXT, "Location" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Joined" TEXT, "Nickname" TEXT)

When was erskine college founded
SELECT "Founded" FROM table_16990 WHERE "Institution" = 'Erskine College'
SELECT "Founded" FROM "table_16990" WHERE "Institution" = 'Erskine College'