Question: when did stephen curry sign with golden state
[{'answer': '2009', 'provenance': [{'wikipedia_id': '5608488', 'title': 'Stephen Curry', 'start_paragraph_id': 19, 'start_character': 65, 'end_paragraph_id': 19, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::College career.:Junior season.\n'}]}]