Question: when was the law of definite proportions developed
[{'answer': '1803', 'provenance': [{'wikipedia_id': '17981', 'title': 'Law of definite proportions', 'start_paragraph_id': 6, 'start_character': 152, 'end_paragraph_id': 6, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '17981', 'title': 'Law of definite proportions', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 361, 'bleu_score': 0.9669306597086381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15822890394789187144}, 'section': 'Section::::History.\n'}]}]