Question: when did ecuador change to the us dollar
[{'answer': 'March 13 , 2000', 'provenance': [{'wikipedia_id': '17553744', 'title': 'Currency of Ecuador', 'start_paragraph_id': 183, 'start_character': 45, 'end_paragraph_id': 183, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::2000 Dollarization.\n'}]}, {'provenance': [{'wikipedia_id': '17553744', 'title': 'Currency of Ecuador', 'start_paragraph_id': 183, 'start_character': 0, 'end_paragraph_id': 183, 'end_character': 267, 'bleu_score': 0.9560167778278961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13316077416547482173}, 'section': 'Section::::2000 Dollarization.\n'}]}]