Question: when did coca cola became a public company
[{'answer': '1919', 'provenance': [{'wikipedia_id': '6690', 'title': 'Coca-Cola', 'start_paragraph_id': 21, 'start_character': 17, 'end_paragraph_id': 21, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::History.:The Coca-Cola Company.\n'}]}, {'provenance': [{'wikipedia_id': '6690', 'title': 'Coca-Cola', 'start_paragraph_id': 47, 'start_character': 0, 'end_paragraph_id': 47, 'end_character': 588, 'bleu_score': 0.9813933169956551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2749416999919575317}, 'section': 'Section::::Production.:Formula of natural flavorings.\n'}]}]