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:
| Election date | Party leader | Number of votes received | Percentage of votes | Number of deputies |
| --- | --- | --- | --- | --- |
| 1964.0 | Habib Bourguiba | 1,255,153 | 100% | 101.0 |
| 1969.0 | Habib Bourguiba | 1,363,939 | 100% | 101.0 |
| 1974.0 | Habib Bourguiba | 1,570,954 | 100% | 112.0 |
| 1979.0 | Habib Bourguiba | 1,560,753 | 100% | 121.0 |
| 1981.0 | Habib Bourguiba | 1,828,363 | 94.2% | 136.0 |
| 1986.0 | Habib Bourguiba | Unknown | Unknown | 125.0 |
Question:
What was the average election year that has less than 136 deputies, and 1,560,753 votes received?
Answer:
1979.0