Question: what year did physical therapy become a doctorate degree
[{'answer': '1992', 'provenance': [{'wikipedia_id': '2110699', 'title': 'Doctor of Physical Therapy', 'start_paragraph_id': 4, 'start_character': 3, 'end_paragraph_id': 4, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::History of the DPT degree.\n'}]}, {'provenance': [{'wikipedia_id': '2110699', 'title': 'Doctor of Physical Therapy', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 442, 'bleu_score': 0.891788949662028, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6042104440369967}, 'section': 'Section::::History of the DPT degree.\n'}]}]