CREATE TABLE table_15835 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Points" CLOB)

What year did Elf Team Tyrrell have 34 points?
SELECT AVG("Year") FROM table_15835 WHERE "Entrant" = 'elf team tyrrell' AND "Points" = '34'
SELECT AVG("Year") FROM "table_15835" WHERE "Entrant" = 'elf team tyrrell' AND "Points" = '34'