CREATE TABLE table_56370 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Pts." FLOAT)

waht is the last year with a mclaren mp4/10b chassis
SELECT MAX("Year") FROM table_56370 WHERE "Chassis" = 'mclaren mp4/10b'
SELECT MAX("Year") FROM "table_56370" WHERE "Chassis" = 'mclaren mp4/10b'