Question: when was goal line technology introduced in football
[{'answer': 'July 2012', 'provenance': [{'wikipedia_id': '19961701', 'title': 'Goal-line technology', 'start_paragraph_id': 2, 'start_character': 193, 'end_paragraph_id': 2, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19961701', 'title': 'Goal-line technology', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 640, 'bleu_score': 0.9281701738685201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4907511226524809053}, 'section': 'Section::::Abstract.'}]}]