CREATE TABLE table_name_21 (points VARCHAR2, engine VARCHAR2, year VARCHAR2)

What is total amount of points of entrants with a ford cosworth engine and a year later than 1991?
SELECT COUNT(points) FROM table_name_21 WHERE engine = "ford cosworth" AND year > 1991
SELECT COUNT("points") FROM "table_name_21" WHERE "engine" = "ford cosworth" AND "year" > 1991