Question: when did george rr martin start writing winds of winter
[{'answer': '2010', 'provenance': [{'wikipedia_id': '12301', 'title': 'A Song of Ice and Fire', 'start_paragraph_id': 30, 'start_character': 278, 'end_paragraph_id': 30, 'end_character': 282, 'bleu_score': 1.0, 'section': 'Section::::Publishing history.:Planned novels and future.:"The Winds of Winter".\n'}]}, {'provenance': [{'wikipedia_id': '12301', 'title': 'A Song of Ice and Fire', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 753, 'bleu_score': 0.9661808264736941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1501134343549954865}, 'section': 'Section::::Publishing history.:Planned novels and future.:"The Winds of Winter".\n'}]}]