CREATE TABLE table_59529 ("Perpetrator" CLOB, "Date" CLOB, "Year" FLOAT, "Location" CLOB, "Country" CLOB, "Killed" FLOAT, "Injured" CLOB)

How many kills have 15 as the injured, with a year prior to 1987?
SELECT SUM("Killed") FROM table_59529 WHERE "Injured" = '15' AND "Year" < '1987'
SELECT SUM("Killed") FROM "table_59529" WHERE "Injured" = '15' AND "Year" < '1987'