CREATE TABLE table_5229 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Tyres" TEXT, "Points" FLOAT)

For a year earlier than 1991 and a reynard 91d chassis, what's the highest points?
SELECT MAX("Points") FROM table_5229 WHERE "Chassis" = 'reynard 91d' AND "Year" < '1991'
SELECT MAX("Points") FROM "table_5229" WHERE "Chassis" = 'reynard 91d' AND "Year" < '1991'