SELECT MAX("Points") FROM table_68426 WHERE "Entrant" = 'modena team spa' AND "Year" > '1991'
What is the highest number of points for the Modena Team Spa after 1991?
CREATE TABLE table_68426 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
)