Question: when did pong become playable on the television
[{'answer': '1974', 'provenance': [{'wikipedia_id': '24947', 'title': 'Pong', 'start_paragraph_id': 12, 'start_character': 86, 'end_paragraph_id': 12, 'end_character': 90, 'bleu_score': 1.0, 'section': 'Section::::Development and history.:Home version.\n'}]}, {'provenance': [{'wikipedia_id': '24947', 'title': 'Pong', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 1094, 'bleu_score': 0.9892757519056121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15458743541079199291}, 'section': 'Section::::Development and history.:Home version.\n'}]}]