How many categories of Senate Seats does Emile Roemer have? 
{'header': ['Name', 'Abbr.', 'Political Leader', 'International Affiliation', 'Votes ( 2012 )', 'House of Rep. seats', 'Senate seats', 'European Parliament seats'], 'page_title': 'List of political parties in the Netherlands', 'section_title': 'Parliamentary parties', 'caption': 'Parliamentary parties', 'rows': [['Labour Party Partij van de Arbeid', 'PvdA', 'Diederik Samsom', 'Socialist International , PES', '2331862', '38', '14', '3'], ['Party for Freedom Partij voor de Vrijheid', 'PVV', 'Geert Wilders', 'none, future International Freedom Alliance', '950055', '15', '10', '5'], ['Socialist Party Socialistische Partij', 'SP', 'Emile Roemer', 'UEL/NGL', '908295', '15', '8', '2'], ['Democrats 66 Politieke Partij Democraten 66', 'D66', 'Alexander Pechtold', 'Liberal International , ELDR', '751504', '12', '5', '3'], ['ChristianUnion ChristenUnie', 'CU', 'Arie Slob', 'ECPM , ECR', '294121', '5', '2', '1'], ['GreenLeft GroenLinks', 'GL', 'Jolande Sap', 'Global Greens , EGP', '219640', '4', '5', '3'], ['Party for Animals Partij voor de Dieren', 'PvdD', 'Marianne Thieme', 'none', '181272', '2', '1', '0'], ['50PLUS 50PLUS', '50+', 'Jan Nagel *', 'none', '176926', '2', '1', '0']]}