Question: when did mama mia by abba come out
[{'answer': '1975', 'provenance': [{'wikipedia_id': '252540', 'title': 'Mamma Mia!', 'start_paragraph_id': 1, 'start_character': 292, 'end_paragraph_id': 1, 'end_character': 296, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '252540', 'title': 'Mamma Mia!', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 598, 'bleu_score': 0.980097014099621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10521466059831250787}, 'section': 'Section::::Abstract.'}]}]