CREATE TABLE table_name_35 (gross_tonnage INT, delivery_date VARCHAR)

with delivery date of 2001 2001 what is gross tonnage?
SELECT AVG(gross_tonnage) FROM table_name_35 WHERE delivery_date = "2001 2001"
SELECT AVG("gross_tonnage") FROM "table_name_35" WHERE "2001 2001" = "delivery_date"