Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Record | Streak | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Sept. 19 | vs. Dallas Cowboys | Loss 49-37 | 0-1 | L1 | 46206.0 |
| 2.0 | Sept. 26 | vs. Miami Dolphins | Loss 29-14 | 0-2 | L2 | 45139.0 |
| 3.0 | Oct. 3 | at Minnesota Vikings | Loss 19-0 | 0-3 | L3 | 47900.0 |
| 4.0 | Oct. 10 | vs. Baltimore Colts | Loss 43-0 | 0-4 | L4 | 46206.0 |
| 5.0 | Oct. 17 | at New York Jets | Loss 28-17 | 0-5 | L5 | 61948.0 |
| 6.0 | Oct. 23 | at San Diego Chargers | Loss 20-3 | 0-6 | L6 | 49261.0 |
| 7.0 | Oct. 31 | vs. St. Louis Cardinals | Loss 28-23 | 0-7 | L7 | 40040.0 |
| 8.0 | Nov. 7 | at Miami Dolphins | Loss 34-0 | 0-8 | L8 | 61016.0 |
| 9.0 | Nov. 14 | at New England Patriots | Loss 38-33 | 0-9 | L9 | 57446.0 |
| 10.0 | Nov. 21 | vs. New York Jets | Loss 20-7 | 0-10 | L10 | 41577.0 |
| 11.0 | Nov. 28 | vs. New England Patriots | Win 27-20 | 1-10 | W1 | 27166.0 |
| 12.0 | Dec. 5 | at Baltimore Colts | Loss 24-0 | 1-11 | L1 | 58476.0 |
| 13.0 | Dec. 12 | vs. Houston Oilers | Loss 20-14 | 1-12 | L2 | 28107.0 |
| 14.0 | Dec. 19 | at Kansas City Chiefs | Loss 22-9 | 1-13 | L3 | 48121.0 |
Question:
What was the week number when they played on Dec. 19?
Answer:
1.0