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 | Attendance |
| --- | --- | --- | --- | --- |
| 1.0 | September 25, 1960 | New York Giants | L 21-19 | 44,598 |
| 2.0 | October 2, 1960 | Los Angeles Rams | W 13-9 | 53,633 |
| 3.0 | October 9, 1960 | at Detroit Lions | W 14-10 | 49,825 |
| 4.0 | October 16, 1960 | at Chicago Bears | L 27-10 | 48,226 |
| 5.0 | October 23, 1960 | at Green Bay Packers | L 41-14 | 39,914 |
| 6.0 | October 30, 1960 | Chicago Bears | W 25-7 | 55,071 |
| 7.0 | November 6, 1960 | Detroit Lions | L 24-0 | 48,447 |
| 8.0 | Bye | Bye | Bye | Bye |
| 9.0 | November 20, 1960 | at Dallas Cowboys | W 26-14 | 10,000 |
| 10.0 | November 27, 1960 | at Baltimore Colts | W 30-22 | 57,808 |
| 11.0 | December 4, 1960 | at Los Angeles Rams | W 23-7 | 77,254 |
| 12.0 | December 10, 1960 | Green Bay Packers | L 13-0 | 53,612 |
| 13.0 | December 18, 1960 | Baltimore Colts | W 34-10 | 57,269 |
Question:
What is the Week number on December 18, 1960?
Answer:
1.0