CREATE TABLE table_name_69 (year INT, entrant VARCHAR, points VARCHAR)

What was the sum of the years, when the entrant was Scuderia Centro Sud, and when there were 6 points?
SELECT SUM(year) FROM table_name_69 WHERE entrant = "scuderia centro sud" AND points = 6
SELECT SUM("year") FROM "table_name_69" WHERE "entrant" = "scuderia centro sud" AND "points" = 6