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:
| Year | Date | Winner | Result | Location |
| --- | --- | --- | --- | --- |
| 1970.0 | October 11 | New York Giants | 30-23 | Yankee Stadium |
| 1970.0 | November 23 | Philadelphia Eagles | 23-20 | Franklin Field |
| 1971.0 | October 24 | Philadelphia Eagles | 23-7 | Veterans Stadium |
| 1971.0 | December 19 | Philadelphia Eagles | 41-28 | Yankee Stadium |
| 1972.0 | October 2 | New York Giants | 27-12 | Veterans Stadium |
| 1972.0 | November 26 | New York Giants | 62-10 | Yankee Stadium |
| 1973.0 | September 23 | Tie | 23-23 | Yankee Stadium |
| 1973.0 | November 25 | Philadelphia Eagles | 20-16 | Veterans Stadium |
| 1974.0 | October 13 | Philadelphia Eagles | 35-7 | Veterans Stadium |
| 1974.0 | November 17 | Philadelphia Eagles | 20-7 | Yale Bowl |
| 1975.0 | September 21 | New York Giants | 23-14 | Veterans Stadium |
| 1975.0 | November 16 | Philadelphia Eagles | 13-10 | Shea Stadium |
| 1976.0 | September 19 | Philadelphia Eagles | 20-7 | Veterans Stadium |
| 1976.0 | October 31 | Philadelphia Eagles | 10-0 | Giants Stadium |
| 1977.0 | October 9 | Philadelphia Eagles | 28-10 | Giants Stadium |
| 1977.0 | December 11 | Philadelphia Eagles | 17-14 | Veterans Stadium |
| 1978.0 | November 19 | Philadelphia Eagles | 19-17 | Giants Stadium |
| 1978.0 | December 17 | Philadelphia Eagles | 20-3 | Veterans Stadium |
| 1979.0 | September 2 | Philadelphia Eagles | 23-17 | Veterans Stadium |
| 1979.0 | September 23 | Philadelphia Eagles | 17-13 | Giant Stadium |
Question:
what is the year when the location is yankee stadium and the result is 23-23
Answer:
1973.0