Question: when was the last time mount st helens erupted
[{'answer': 'January 16 , 2008', 'provenance': [{'wikipedia_id': '36649', 'title': 'Mount St. Helens', 'start_paragraph_id': 43, 'start_character': 3, 'end_paragraph_id': 43, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Geologic history.:Modern eruptive period.:2004 to 2008 activity.\n'}]}, {'provenance': [{'wikipedia_id': '36649', 'title': 'Mount St. Helens', 'start_paragraph_id': 43, 'start_character': 0, 'end_paragraph_id': 43, 'end_character': 477, 'bleu_score': 0.976327165973018, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6435391720864780804}, 'section': 'Section::::Geologic history.:Modern eruptive period.:2004 to 2008 activity.\n'}]}]