How many leaders has South Korea had since 1945 that aligned with the "Independent" political party?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q82955', 'id': 0, 'label': 'politician'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q327591', 'id': 1, 'label': 'independent politician'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q884', 'id': 2, 'label': 'South Korea'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q165210', 'id': 3, 'label': 'Kim Young-sam'}], 'links': [{'name_': 'P279', 'source': 1, 'target': 0, 'label': 'subclass of'}, {'name_': 'P106', 'source': 3, 'target': 0, 'label': 'occupation'}, {'name_': 'P27', 'source': 3, 'target': 2, 'label': 'country of citizenship'}]}