What is the percentage change in the amount under Foreign in 2019 from 2018?
{"": {"2019": "", "2018": "(in thousands)", "2017": ""}, "United States": {"2019": -535, "2018": -51049, "2017": -70566}, "Foreign": {"2019": 52881, "2018": 65935, "2017": 59484}, "Total": {"2019": 52346, "2018": 14886, "2017": -11082}}
foreign_2019 = df["Foreign"]["2019"]
foreign_2018 = df["Foreign"]["2018"]
answer = ( foreign_2019 - foreign_2018 ) / foreign_2018 * 100.0