Table schema:
CREATE TABLE table_name_86 (election_date INTEGER, number_of_deputies VARCHAR, number_of_votes_received VARCHAR)

Question: What was the average election year that has less than 136 deputies, and 1,560,753 votes received?
SQL: SELECT AVG(election_date) FROM table_name_86 WHERE number_of_deputies < 136 AND number_of_votes_received = "1,560,753"