Question: when did the el salvador civil war end
[{'answer': '16 January 1992', 'provenance': [{'wikipedia_id': '4187252', 'title': 'Salvadoran Civil War', 'start_paragraph_id': 105, 'start_character': 148, 'end_paragraph_id': 105, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Death squads and peace accords: 1990–1992.\n'}]}]