Question: when was the last year dimes were made of silver
[{'answer': '1965', 'provenance': [{'wikipedia_id': '374688', 'title': 'Dime (United States coin)', 'start_paragraph_id': 7, 'start_character': 39, 'end_paragraph_id': 7, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '374688', 'title': 'Dime (United States coin)', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 450, 'bleu_score': 0.8537376411238151, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1937803225991817845}, 'section': 'Section::::History.\n'}]}]