Question: when was womens water polo added to the olympics
[{'answer': '2000 Summer Olympics', 'provenance': [{'wikipedia_id': '4334585', 'title': 'Water polo at the Summer Olympics', 'start_paragraph_id': 1, 'start_character': 144, 'end_paragraph_id': 1, 'end_character': 164, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4334585', 'title': 'Water polo at the Summer Olympics', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 343, 'bleu_score': 0.597994770026663, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12925588154898003721}, 'section': 'Section::::Abstract.'}]}]