What is the total number of quantity when the introductory year was 1984?
CREATE TABLE table_name_30 (quantity INTEGER, introduced VARCHAR)
SELECT SUM(quantity) FROM table_name_30 WHERE introduced = 1984
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_30 (quantity INTEGER, introduced VARCHAR) Question: What is the total number of quantity when the introductory year was 1984? [/INST] SELECT SUM(quantity) FROM table_name_30 WHERE introduced = 1984 </s>