CREATE TABLE table_203_610 (id DECIMAL, "institution" TEXT, "location" TEXT, "nickname" TEXT, "founded" DECIMAL, "historical affiliation" TEXT, "enrollment" DECIMAL, "primary conference" TEXT)

what are the number of ivy league institutions ?
SELECT COUNT("institution") FROM table_203_610 WHERE "primary conference" = 'ivy league'
SELECT COUNT("institution") FROM "table_203_610" WHERE "primary conference" = 'ivy league'