What was the Attendance on December 21, 1986 before Week 16?
CREATE TABLE table_48583 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Attendance" real
)
SELECT SUM("Attendance") FROM table_48583 WHERE "Date" = 'december 21, 1986' AND "Week" < '16'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the Attendance on December 21, 1986 before Week 16? ### Input: CREATE TABLE table_48583 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Attendance" real
) ### Response: SELECT SUM("Attendance") FROM table_48583 WHERE "Date" = 'december 21, 1986' AND "Week" < '16'