CREATE TABLE table_70404 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

How many years did Barclay Nordica Arrows BMW enter with Cosworth v8 engine?
SELECT SUM("Year") FROM table_70404 WHERE "Entrant" = 'barclay nordica arrows bmw' AND "Engine" = 'cosworth v8'
SELECT SUM("Year") FROM "table_70404" WHERE "Engine" = 'cosworth v8' AND "Entrant" = 'barclay nordica arrows bmw'