Question: when did pizza hut start charging for delivery
[{'answer': '1999', 'provenance': [{'wikipedia_id': '1668848', 'title': 'Pizza delivery', 'start_paragraph_id': 9, 'start_character': 120, 'end_paragraph_id': 9, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Charge.\n'}]}, {'provenance': [{'wikipedia_id': '1668848', 'title': 'Pizza delivery', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 676, 'bleu_score': 0.953442195146827, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13800115351733676537}, 'section': 'Section::::Charge.\n'}]}]