What was the percentage change in the total income before income tax between 2019 and 2020?
{"Domestic": {"January 31, 2020": 895, "February 1, 2019": 680, "February 2, 2018": 462}, "Foreign": {"January 31, 2020": 543, "February 1, 2019": 1149, "February 2, 2018": 1115}, "Total income before income tax": {"January 31, 2020": 1438, "February 1, 2019": 1829, "February 2, 2018": 1577}}
total_income_2020 = df["Total income before income tax"]["January 31, 2020"]
total_income_2019 = df["Total income before income tax"]["February 1, 2019"]
answer = (total_income_2020 - total_income_2019) / total_income_2019 * 100.0