What was the change in Foreign income between 2017 and 2018?
{"Domestic (U.S.) (1)": {"2019": 95639, "2018": 141582, "2017": -67}, "Foreign (Outside U.S.) (1)": {"2019": 74792, "2018": 45485, "2017": 9875}, "Total (1)": {"2019": 170431, "2018": 187067, "2017": 9808}}
foreign_income_2018 = df["Foreign (Outside U.S.) (1)"]["2018"]
foreign_income_2017 = df["Foreign (Outside U.S.) (1)"]["2017"]
answer = foreign_income_2018 - foreign_income_2017