How many leaders has South Korea had since 1945 that aligned with the "Independent" political party?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q327591', 'id': 0, 'label': 'independent politician'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q884', 'id': 1, 'label': 'South Korea'}, {'type': 'INTERNAL', 'name_': 'Q1253', 'id': 2, 'label': 'Ban Ki-moon'}, {'type': 'INTERNAL', 'name_': 'Q20927', 'id': 3, 'label': 'Daegu'}, {'type': 'INTERNAL', 'name_': 'Q138048', 'id': 4, 'label': 'Park Geun-hye'}, {'type': 'INTERNAL', 'name_': 'Q495118', 'id': 5, 'label': '2003 Summer Universiade'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q14345', 'id': 6, 'label': 'Roh Moo-hyun'}, {'type': 'INTERNAL', 'name_': 'Q12599628', 'id': 7, 'label': 'Roh Moo Hyun Foundation'}], 'links': [{'name_': 'P102', 'source': 2, 'target': 0, 'label': 'member of political party'}, {'name_': 'P27', 'source': 2, 'target': 1, 'label': 'country of citizenship'}, {'name_': 'P102', 'source': 4, 'target': 0, 'label': 'member of political party'}, {'name_': 'P27', 'source': 4, 'target': 1, 'label': 'country of citizenship'}, {'name_': 'P19', 'source': 4, 'target': 3, 'label': 'place of birth'}, {'name_': 'P276', 'source': 5, 'target': 3, 'label': 'location'}, {'name_': 'P1656', 'source': 5, 'target': 6, 'label': 'unveiled by'}, {'name_': 'P17', 'source': 7, 'target': 1, 'label': 'country'}, {'name_': 'P138', 'source': 7, 'target': 6, 'label': 'named after'}]}