Question: who won the nba championship 2 years ago
[{'answer': 'Cleveland', 'provenance': [{'wikipedia_id': '890793', 'title': 'NBA Finals', 'start_paragraph_id': 39, 'start_character': 999, 'end_paragraph_id': 39, 'end_character': 1008, 'bleu_score': 1.0, 'section': "Section::::History.:1999–2010: Lakers' & Spurs' dominance.\n"}]}, {'provenance': [{'wikipedia_id': '890793', 'title': 'NBA Finals', 'start_paragraph_id': 53, 'start_character': 0, 'end_paragraph_id': 53, 'end_character': 1287, 'bleu_score': 0.8906009780277211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7015695845247267391}, 'section': "Section::::History.:2015–present: Warriors' dynasty.\n"}]}]