Question: when did response to state of the union start
[{'answer': '1966', 'provenance': [{'wikipedia_id': '26062172', 'title': 'Response to the State of the Union address', 'start_paragraph_id': 2, 'start_character': 22, 'end_paragraph_id': 2, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'in 1966', 'provenance': [{'wikipedia_id': '26062172', 'title': 'Response to the State of the Union address', 'start_paragraph_id': 2, 'start_character': 19, 'end_paragraph_id': 2, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26062172', 'title': 'Response to the State of the Union address', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 538, 'bleu_score': 0.9382880328341491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15130862466895490817}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43416076', 'title': '1966 State of the Union Address', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The 1966 State of the Union Address was given by Lyndon B. Johnson, the 36th President of the United States, on Wednesday, January 12, 1966, to the 89th United States Congress.', 'The 1966 State of the Union Address was given by Lyndon']}}]}, {'provenance': [{'wikipedia_id': '26062172', 'title': 'Response to the State of the Union address', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['The practice began in 1966 when Republican U.S. Senator Everett Dirksen (Illinois) and U.S. Representative Gerald Ford (Michigan) appeared on TV', 'The practice began in 1966 when Republican U.S.']}}]}, {'provenance': [{'wikipedia_id': '37081', 'title': 'State of the Union', 'section': 'Section::::Delivery of the speech.:Content of the speech.\n', 'start_paragraph_id': 35, 'end_paragraph_id': 35, 'meta': {'evidence_span': ["State of the Union speeches usually last a little over an hour, partly because of the large amounts of applause that occur from the audience throughout. The applause is often political in tone, with many portions of the speech being applauded only by members of the President's own party. As non-political officeholders, members of the Supreme Court or the Joint Chiefs of Staff rarely applaud in order to retain the appearance of political impartiality. In recent years, the presiding officers of the House and the Senate, the Speaker and the Vice President, respectively, have departed from the neutrality expected of presiding officers of deliberative bodies, as they, too, stand and applaud in response to the remarks of the President with which they agree. Since 1966, the speech has been followed on television by a response or rebuttal by a member of the major political party opposing the President's party. The response is typically broadcast from a studio with no audience. In 1970, the Democratic Party", 'Since 1966, the speech has been followed on television by a response']}}]}]