Question: when was the world wide web first used
[{'answer': '1990', 'provenance': [{'wikipedia_id': '4192777', 'title': 'History of the World Wide Web', 'start_paragraph_id': 11, 'start_character': 181, 'end_paragraph_id': 11, 'end_character': 185, 'bleu_score': 1.0, 'section': 'Section::::1980–1991: Invention and implementation of the Web.\n'}]}, {'provenance': [{'wikipedia_id': '4192777', 'title': 'History of the World Wide Web', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 803, 'bleu_score': 0.984904577301502, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10933352332799291113}, 'section': 'Section::::1980–1991: Invention and implementation of the Web.\n'}]}]