Question: when did they change the drinking age to 21 in california
[{'answer': '1933', 'provenance': [{'wikipedia_id': '19197423', 'title': 'U.S. history of alcohol minimum purchase age by state', 'start_paragraph_id': 3, 'start_character': 25, 'end_paragraph_id': 3, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]