Question: when was the last time the san diego chargers went to the playoffs
[{'answer': '2013', 'provenance': [{'wikipedia_id': '9984506', 'title': 'History of the San Diego Chargers', 'start_paragraph_id': 93, 'start_character': 37, 'end_paragraph_id': 93, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::2006–2012: Rise of Philip Rivers.:2010–2012.\n'}]}]