If unknown is larger than 1.0, what is the maximum two year amount?
{'header': ['Year', 'Total', 'Less than a year', 'One year', 'Two years', 'Three years', 'Four years', '5–9 years', '10–14 years', '15–19 years', '20–24 years', '25 and more', 'Unknown'], 'page_title': '', 'page_id': '', 'types': ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real'], 'id': '1-174266-6', 'section_title': '', 'caption': '', 'rows': [['2004', '1 293', '54', '149', '181', '129', '97', '249', '221', '118', '48', '45', '2'], ['2005', '1 445', '67', '143', '186', '172', '148', '272', '228', '137', '52', '40', '0'], ['2006', '1 480', '74', '152', '191', '172', '177', '351', '147', '128', '46', '41', '1'], ['2007', '1 558', '149', '208', '162', '177', '206', '334', '128', '106', '50', '38', '0'], ['2008', '1 026', '73', '141', '121', '103', '146', '258', '72', '62', '24', '26', '0'], ['2009', '1 555', '122', '213', '190', '170', '170', '419', '109', '67', '55', '40', '0'], ['2010', '1 453', '124', '215', '202', '170', '129', '377', '86', '68', '37', '45', '0'], ['2011', '1469', '129', '211', '159', '154', '139', '384', '104', '77', '49', '63', '0']], 'name': 'table_174266_6'}