CREATE TABLE table_203_717 (id NUMBER, "number" NUMBER, "year built" NUMBER, "livery" CLOB, "current status" CLOB, "notes" CLOB)

how many of the tramways were built before the 1970s ?
SELECT COUNT(*) FROM table_203_717 WHERE "year built" < 1970
SELECT COUNT(*) FROM "table_203_717" WHERE "year built" < 1970