What is the area in km2 for Dufferin? 
{'header': ['Official Name', 'Status', 'Area km 2', 'Population', 'Census Ranking'], 'page_title': 'Charlotte County, New Brunswick', 'section_title': 'Parishes', 'caption': 'Parishes', 'rows': [['Saint George', 'Parish', '499.51', '2476', '1,146 of 5,008'], ['Pennfield', 'Parish', '363.88', '2322', '1,206 of 5,008'], ['Saint Stephen', 'Parish', '104.41', '2113', '1,268 of 5,008'], ['Saint David', 'Parish', '189.91', '1499', '1,592 of 5,008'], ['Saint James', 'Parish', '555.99', '1350', '1,706 of 5,008'], ['Campobello', 'Parish', '39.59', '1056', '1,986 of 5,008'], ['Lepreau', 'Parish', '209.40', '824', '2,319 of 5,008'], ['West Isles', 'Parish', '37.93', '824', '2,319 of 5,008'], ['Saint Patrick', 'Parish', '236.76', '721', '2,525 of 5,008'], ['Saint Croix', 'Parish', '78.67', '670', '2,630 of 5,008'], ['Saint Andrews', 'Parish', '24.38', '592', '2,797 of 5,008'], ['Dufferin', 'Parish', '12.40', '535', '2,919 of 5,008'], ['Dumbarton', 'Parish', '375.06', '356', '3,474 of 5,008'], ['Grand Manan', 'Parish', '6.20', '190', '4,057 of 5,008']]}