What is the company's change in foreign income between 2018 and 2019?
{"Domestic loss": {"2019": -20345, "2018": -29658, "2017": -13752}, "Foreign income": {"2019": 3933, "2018": 3123, "2017": 4207}, "Loss before income taxes": {"2019": -16412, "2018": -26535, "2017": -9545}}
foreign_income_2019 = df["Foreign income"]["2019"]
foreign_income_2018 = df["Foreign income"]["2018"]
answer = ( foreign_income_2019 - foreign_income_2018 ) / foreign_income_2018 * 100.0