Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_91 (attendance INTEGER, date VARCHAR, week VARCHAR)

### Question ###
What was the Attendance on December 21, 1986 before Week 16?

### Accurate SQL ###

SELECT SUM(attendance) FROM table_name_91 WHERE date = "december 21, 1986" AND week < 16