Question: when did jenni rivera start her singing career
[{'answer': '1992 .', 'provenance': [{'wikipedia_id': '5535835', 'title': 'Jenni Rivera', 'start_paragraph_id': 2, 'start_character': 32, 'end_paragraph_id': 2, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5535835', 'title': 'Jenni Rivera', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1101, 'bleu_score': 0.9698038122635291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7415960654209332778}, 'section': 'Section::::Abstract.'}]}]