Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_54 (built INTEGER, vessel_name VARCHAR, class VARCHAR, type VARCHAR)
### Question:
Which year was the vessel Deva built as a Panamax DNV class ship?
### Answer:
SELECT SUM(built) FROM table_name_54 WHERE class = "dnv" AND type = "panamax" AND vessel_name = "deva"