What is the percentage change in total net pool performance from 2017 to 2018?
{"Amounts in thousands of U.S. Dollars -- Pool gross revenues (included in Revenues)": {"2017": 38046, "2018": 102253}, "Amounts in thousands of U.S. Dollars -- Pool gross voyage expenses and commissions (included in Voyage expenses and commissions)": {"2017": -9122, "2018": -10154}, "Amounts in thousands of U.S. Dollars -- GasLogs adjustment for net pool allocation (included in Net pool allocation)": {"2017": 7254, "2018": 17818}, "Amounts in thousands of U.S. Dollars -- GasLogs total net pool performance": {"2017": 36178, "2018": 109917}}
total_2018 = df["Amounts in thousands of U.S. Dollars -- GasLogs total net pool performance"]["2018"]
total_2017 = df["Amounts in thousands of U.S. Dollars -- GasLogs total net pool performance"]["2017"]
answer = (total_2018 - total_2017) / total_2017 * 100.0