Question: when did they add lights to wrigley field
[{'answer': '1988', 'provenance': [{'wikipedia_id': '21151238', 'title': 'History of Wrigley Field', 'start_paragraph_id': 53, 'start_character': 368, 'end_paragraph_id': 53, 'end_character': 372, 'bleu_score': 1.0, 'section': 'Section::::"Beautiful Wrigley Field" (1932–1981).:First attempt at lights (1941).\n'}]}, {'provenance': [{'wikipedia_id': '21151238', 'title': 'History of Wrigley Field', 'start_paragraph_id': 62, 'start_character': 0, 'end_paragraph_id': 62, 'end_character': 425, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11362027339860005379}, 'section': 'Section::::"Building a New Tradition in the Friendly Confines" (1981–present).:Night baseball (1988).\n'}]}]