What was percentage change in the total gain between 2018 and 2019?
{"Amounts reclassified from AOCI to earnings: -- Net sales": {"2019": "$\u2014", "2018": 383, "2017": -488}, "Amounts reclassified from AOCI to earnings: -- Cost of goods sold": {"2019": 860, "2018": -6, "2017": 497}, "Amounts reclassified from AOCI to earnings: -- Selling, general and administrative": {"2019": 92, "2018": 107, "2017": 45}, "Amounts reclassified from AOCI to earnings: -- Total amounts reclassified from AOCI to earnings": {"2019": 952, "2018": 484, "2017": 54}, "Amounts reclassified from AOCI to earnings: -- Loss recognized in other expense for hedge ineffectiveness": {"2019": "\u2014", "2018": "\u2014", "2017": -1}, "Amounts reclassified from AOCI to earnings: -- Loss recognized in other expense for derivatives not designated as cash flow hedges": {"2019": "\u2014", "2018": "\u2014", "2017": -15}, "Amounts reclassified from AOCI to earnings: -- Total derivative gain on foreign exchange contracts recognized in earnings": {"2019": 952, "2018": 484, "2017": 38}, "Interest Rate Swaps: -- Benefit recorded in interest expense": {"2019": 491, "2018": 421, "2017": 37}, "Interest Rate Swaps: -- Total gain": {"2019": 1443, "2018": 905, "2017": 75}}
total_gain_2019 = df["Interest Rate Swaps: -- Total gain"]["2019"]
total_gain_2018 = df["Interest Rate Swaps: -- Total gain"]["2018"]
answer = (total_gain_2019 - total_gain_2018) / total_gain_2018 * 100.0