Question: what year did the golden state warriors win their first nba championship
[{'answer': '1947', 'provenance': [{'wikipedia_id': '72891', 'title': 'Golden State Warriors', 'start_paragraph_id': 2, 'start_character': 87, 'end_paragraph_id': 2, 'end_character': 91, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '72891', 'title': 'Golden State Warriors', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['The Warriors won the inaugural Basketball Association of America (BAA) championship in 1947, and won its second championship in 1956, led by Hall of Fame trio Paul Arizin, Tom Gola, and Neil Johnston.', 'The Warriors won the inaugural Basketball Association of America (BAA) championship in 1947, and won its second championship in 1956, led by Hall of Fame trio Paul Arizin, Tom Gola, and Neil Johnston.']}}]}]