CREATE TABLE table_71691 ("Year" FLOAT, "Class" CLOB, "Vehicle" CLOB, "Position" CLOB, "Stages won" CLOB)

What is the average year that has a car that won 0 stages with a position of DNF?
SELECT AVG("Year") FROM table_71691 WHERE "Class" = 'car' AND "Stages won" = '0' AND "Position" = 'dnf'
SELECT AVG("Year") FROM "table_71691" WHERE "Class" = 'car' AND "Position" = 'dnf' AND "Stages won" = '0'