How many Republican governors has California had since 1990?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q29468', 'id': 0, 'label': 'Republican Party'}, {'type': 'INTERNAL', 'name_': 'Q484263', 'id': 1, 'label': 'Lake County'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q99', 'id': 2, 'label': 'California'}, {'type': 'INTERNAL', 'name_': 'Q108067', 'id': 3, 'label': 'Sonoma County'}, {'type': 'INTERNAL', 'name_': 'Q169011', 'id': 4, 'label': 'John C. Frémont'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q156361', 'id': 5, 'label': 'Lake County'}, {'type': 'INTERNAL', 'name_': 'Q4704756', 'id': 6, 'label': 'Al Salvi'}, {'type': 'INTERNAL', 'name_': 'Q3109025', 'id': 7, 'label': 'The Geysers'}], 'links': [{'name_': 'P1889', 'source': 1, 'target': 5, 'label': 'different from'}, {'name_': 'P131', 'source': 3, 'target': 2, 'label': 'located in the administrative territorial entity'}, {'name_': 'P47', 'source': 3, 'target': 5, 'label': 'shares border with'}, {'name_': 'P102', 'source': 4, 'target': 0, 'label': 'member of political party'}, {'name_': 'P102', 'source': 6, 'target': 0, 'label': 'member of political party'}, {'name_': 'P551', 'source': 6, 'target': 1, 'label': 'residence'}, {'name_': 'P131', 'source': 7, 'target': 3, 'label': 'located in the administrative territorial entity'}, {'name_': 'P61', 'source': 7, 'target': 4, 'label': 'discoverer or inventor'}, {'name_': 'P131', 'source': 7, 'target': 5, 'label': 'located in the administrative territorial entity'}]}