What was the percentage change in total income (loss) between 2017 and 2018?
{"Domestic (1)": {"2019": -415707, "2018": -426897, "2017": -373690}, "Foreign (1)": {"2019": 866411, "2018": 800298, "2017": 629923}, "": {"2019": 450704, "2018": 373401, "2017": 256233}}
income_2018 = df[""]["2018"]
income_2017 = df[""]["2017"]
answer = (income_2018 - income_2017) / income_2017 * 100.0