Question: when did the troubles in northern ireland start and end
[{'answer': '1968', 'provenance': [{'wikipedia_id': '30770', 'title': 'The Troubles', 'start_paragraph_id': 32, 'start_character': 243, 'end_paragraph_id': 32, 'end_character': 247, 'bleu_score': 1.0, 'section': 'Section::::Late 1960s.\n'}]}, {'answer': '1998', 'provenance': [{'wikipedia_id': '30770', 'title': 'The Troubles', 'start_paragraph_id': 1, 'start_character': 336, 'end_paragraph_id': 1, 'end_character': 340, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]