user: Question: What was the total attendance on december 14, 1975 after week 13?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 21, 1975', 'San Francisco 49ers', 'W 27–17', 46479.0]
SQL:

assistant: SELECT SUM("Attendance") FROM "Table" WHERE "Date" = 'december 14, 1975' AND "Week" > 13.0;