CREATE TABLE table_67618 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Name the total number of years for brm straight-4
SELECT COUNT("Year") FROM table_67618 WHERE "Engine" = 'brm straight-4'
SELECT COUNT("Year") FROM "table_67618" WHERE "Engine" = 'brm straight-4'