What's the 1948/49 expenditure (in $ millions) in the country whose 1949/50 expenditure is $921 millions?
{'header': ['Country', '1948/49 ($ millions)', '1949/50 ($ millions)', '1950/51 ($ millions)', 'Cumulative ($ millions)'], 'page_title': 'Marshall Plan', 'section_title': 'Expenditures', 'caption': 'Expenditures', 'rows': [['Austria', '232', '166', '70', '468'], ['Belgium and Luxembourg', '195', '222', '360', '777'], ['Denmark', '103', '87', '195', '385'], ['France', '1085', '691', '520', '2296'], ['West Germany', '510', '438', '500', '1448'], ['Greece', '175', '156', '45', '376'], ['Iceland', '6', '22', '15', '43'], ['Ireland', '88', '45', '0', '133'], ['Italy and Trieste', '594', '405', '205', '1204'], ['Netherlands', '471', '302', '355', '1128'], ['Norway', '82', '90', '200', '372'], ['Portugal', '0', '0', '70', '70'], ['Sweden', '39', '48', '260', '347'], ['Switzerland', '0', '0', '250', '250'], ['Turkey', '28', '59', '50', '137'], ['United Kingdom', '1316', '921', '1060', '3297']]}