CREATE TABLE table_name_88 (year INT, points VARCHAR, chassis VARCHAR)

Which year has a total of 0 points and a chassis of Toleman tg181?
SELECT AVG(year) FROM table_name_88 WHERE points = 0 AND chassis = "toleman tg181"
SELECT AVG("year") FROM "table_name_88" WHERE "chassis" = "toleman tg181" AND "points" = 0