CREATE TABLE table_203_135 (id DECIMAL, "institution" TEXT, "location" TEXT, "founded" DECIMAL, "type" TEXT, "enrollment" DECIMAL, "joined" DECIMAL, "nickname" TEXT)

how many conference schools were founded before 1900 ?
SELECT COUNT("institution") FROM table_203_135 WHERE "founded" < 1900
SELECT COUNT("institution") FROM "table_203_135" WHERE "founded" < 1900