What was the percentage change in profit from operations from 2018 to 2019?
{"Amounts are in thousands of U.S. Dollars -- Revenues": {"2018": 618344, "2019": 668637, "Change": 50293}, "Amounts are in thousands of U.S. Dollars -- Net pool allocation": {"2018": 17818, "2019": -4264, "Change": -22082}, "Amounts are in thousands of U.S. Dollars -- Voyage expenses and commissions": {"2018": -20374, "2019": -23772, "Change": -3398}, "Amounts are in thousands of U.S. Dollars -- Vessel operating and supervision costs": {"2018": -128084, "2019": -139662, "Change": -11578}, "Amounts are in thousands of U.S. Dollars -- Depreciation": {"2018": -153193, "2019": -168041, "Change": -14848}, "Amounts are in thousands of U.S. Dollars -- General and administrative expenses": {"2018": -41993, "2019": -47385, "Change": -5392}, "Amounts are in thousands of U.S. Dollars -- Impairment loss on vessels": {"2018": "\u2014", "2019": -162149, "Change": -162149}, "Amounts are in thousands of U.S. Dollars -- Profit from operations": {"2018": 292518, "2019": 123364, "Change": -169154}, "Amounts are in thousands of U.S. Dollars -- Financial costs": {"2018": -166627, "2019": -190481, "Change": -23854}, "Amounts are in thousands of U.S. Dollars -- Financial income": {"2018": 4784, "2019": 5318, "Change": 534}, "Amounts are in thousands of U.S. Dollars -- Loss on derivatives": {"2018": -6077, "2019": -55441, "Change": -49364}, "Amounts are in thousands of U.S. Dollars -- Share of profit of associates": {"2018": 1800, "2019": 1627, "Change": -173}, "Amounts are in thousands of U.S. Dollars -- Total other expenses, net": {"2018": -166120, "2019": -238977, "Change": -72857}, "Amounts are in thousands of U.S. Dollars -- Profit/(loss) for the year": {"2018": 126398, "2019": -115613, "Change": -242011}, "Amounts are in thousands of U.S. Dollars -- Non-controlling interests": {"2018": 78715, "2019": -14952, "Change": -93667}, "Amounts are in thousands of U.S. Dollars -- Profit/(loss) attributable to owners of the Group": {"2018": 47683, "2019": -100661, "Change": -148344}}
profit_2019 = df["Amounts are in thousands of U.S. Dollars -- Profit from operations"]["2019"]
profit_2018 = df["Amounts are in thousands of U.S. Dollars -- Profit from operations"]["2018"]
answer = (profit_2019 - profit_2018) / profit_2018 * 100.0