Question: when did softball change from white to yellow
[{'answer': '2004', 'provenance': [{'wikipedia_id': '80763', 'title': 'Softball', 'start_paragraph_id': 39, 'start_character': 3, 'end_paragraph_id': 39, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Equipment.:Ball.\n'}]}, {'provenance': [{'wikipedia_id': '80763', 'title': 'Softball', 'start_paragraph_id': 39, 'start_character': 0, 'end_paragraph_id': 39, 'end_character': 407, 'bleu_score': 0.9318557434050331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12584092374148333780}, 'section': 'Section::::Equipment.:Ball.\n'}]}]