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_30 (quantity INTEGER, introduced VARCHAR)
### Question:
What is the total number of quantity when the introductory year was 1984?
### Answer:
SELECT SUM(quantity) FROM table_name_30 WHERE introduced = 1984