CREATE TABLE table_49674 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" TEXT)

how many times is the chassis brabham bt33?
SELECT COUNT("Year") FROM table_49674 WHERE "Chassis" = 'brabham bt33'
SELECT COUNT("Year") FROM "table_49674" WHERE "Chassis" = 'brabham bt33'