Question: when did the vfl change to the afl
[{'answer': '1990', 'provenance': [{'wikipedia_id': '30664999', 'title': 'History of the Australian Football League', 'start_paragraph_id': 42, 'start_character': 11, 'end_paragraph_id': 42, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::AFL.\n'}]}, {'provenance': [{'wikipedia_id': '30664999', 'title': 'History of the Australian Football League', 'start_paragraph_id': 43, 'start_character': 0, 'end_paragraph_id': 43, 'end_character': 561, 'bleu_score': 0.9389730586704471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17175132390603195292}, 'section': 'Section::::AFL.:1990s.\n'}]}]