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_4 (killed INTEGER, injured VARCHAR, year VARCHAR)
### Question:
How many kills have 15 as the injured, with a year prior to 1987?
### Answer:
SELECT SUM(killed) FROM table_name_4 WHERE injured = "15" AND year < 1987