Question: when did the cubs won a world series
[{'answer': '2016', 'provenance': [{'wikipedia_id': '6654', 'title': 'Chicago Cubs', 'start_paragraph_id': 2, 'start_character': 476, 'end_paragraph_id': 2, 'end_character': 480, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1907', 'provenance': [{'wikipedia_id': '6654', 'title': 'Chicago Cubs', 'start_paragraph_id': 2, 'start_character': 318, 'end_paragraph_id': 2, 'end_character': 322, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1908', 'provenance': [{'wikipedia_id': '6654', 'title': 'Chicago Cubs', 'start_paragraph_id': 2, 'start_character': 327, 'end_paragraph_id': 2, 'end_character': 331, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6654', 'title': 'Chicago Cubs', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 916, 'bleu_score': 0.85676945657903, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18288614027876176543}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6654', 'title': 'Chicago Cubs', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['consecutive World Series, and the first to win it twice. Most recently, the Cubs won the 2016 National League Championship Series and 2016 World Series, which ended a 71-year National League pennant drought and a 108-year World Series championship drought, both of which are record droughts in Major League Baseball.', 'The Cubs have appeared in a total of eleven World Series. The 1906 Cubs won 116 games, finishing 11636 and posting a modern-era record winning percentage of , before losing the World Series to the Chicago White Sox ("The Hitless Wonders") by four games to two. The Cubs won back-to-back World Series championships in 1907 and 1908, becoming the first major league team to play in three consecutive World Series, and the first to win it twice. Most recently, the Cubs won the 2016 National League Championship Series and 2016 World Series, which ended a 71-year National League pennant drought and a 108-year World Series championship drought,', 'The Cubs won back-to-back World Series championships in 1907 and 1908,']}}]}]