Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_35 ( gross_tonnage INTEGER, delivery_date VARCHAR )

### Question ###
with delivery date of 2001 2001 what is gross tonnage?

### Accurate SQL ###

SELECT AVG(gross_tonnage) FROM table_name_35 WHERE delivery_date = "2001 2001"