What was the percentage change in the total income before income taxes between 2018 and 2019?
{"Domestic": {"April 26, 2019": 678, "April 27, 2018": 589, "April 28, 2017": 166}, "Foreign": {"April 26, 2019": 590, "April 27, 2018": 610, "April 28, 2017": 455}, "Total": {"April 26, 2019": 1268, "April 27, 2018": 1199, "April 28, 2017": 621}}
total_income_2019 = df["Total"]["April 26, 2019"]
total_income_2018 = df["Total"]["April 27, 2018"]
answer = (total_income_2019 - total_income_2018) / total_income_2018 * 100.0