How many times did district of Columbia receive a score for evening gown?
{'header': ['State', 'Preliminaries', 'Interview', 'Swimsuit', 'Evening Gown', 'Average'], 'page_title': 'Miss Teen USA 1987', 'section_title': 'Final competition scores', 'caption': 'Final competition scores', 'rows': [['Mississippi', '8.852', '9.123', '9.366', '9.343', '9.277'], ['North Dakota', '8.622', '9.005', '9.132', '9.073', '9.070'], ['Oklahoma', '8.467', '8.554', '8.948', '9.027', '8.843'], ['North Carolina', '8.425', '8.766', '8.788', '8.854', '8.802'], ['Louisiana', '8.350', '8.712', '8.908', '8.754', '8.791'], ['California', '8.647', '8.582', '8.763', '9.008', '8.784'], ['District of Columbia', '8.438', '8.997', '8.487', '8.631', '8.705'], ['Massachusetts', '8.400', '8.608', '8.703', '8.698', '8.669'], ['New York', '8.292', '8.811', '8.503', '8.675', '8.663']]}