What is the last year that someone is first elected in this table?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1958', 'page_id': '', 'types': ['text', 'text', 'text', 'real', 'text', 'text'], 'id': '1-1341930-21', 'section_title': '', 'caption': '', 'rows': [['Massachusetts 2', 'Edward Boland', 'Democratic', '1952', 'Re-elected', 'Edward Boland (D) Unopposed'], ['Massachusetts 3', 'Philip Philbin', 'Democratic', '1942', 'Re-elected', 'Philip Philbin (D) Unopposed'], ['Massachusetts 6', 'William H. Bates', 'Republican', '1950', 'Re-elected', 'William H. Bates (R) Unopposed'], ['Massachusetts 7', 'Thomas J. Lane', 'Democratic', '1941', 'Re-elected', 'Thomas J. Lane (D) 75.6% Robert T. Breed (R) 24.4%'], ['Massachusetts 11', "Tip O'Neill", 'Democratic', '1952', 'Re-elected', "Tip O'Neill (D) 80.4% Elliott H. Stone (R) 19.6%"]], 'name': 'table_1341930_21'}