What was the change in the Balance at Beginning of Fiscal Year from 2018 to 2019?
{"Balance at Beginning of Fiscal Year": {"April 27, 2019": 1.4, "April 28, 2018": 1.3}, "Increases for Positions Related to the Prior Years": {"April 27, 2019": 1.8, "April 28, 2018": "\u2014"}, "Increases for Positions Related to the Current Year": {"April 27, 2019": 0.9, "April 28, 2018": 0.1}, "Decreases for Positions Related to the Prior Years": {"April 27, 2019": "\u2014", "April 28, 2018": "\u2014"}, "Lapsing of Statutes of Limitations": {"April 27, 2019": -1.0, "April 28, 2018": "\u2014"}, "Balance at End of Fiscal Year": {"April 27, 2019": 3.1, "April 28, 2018": 1.4}}
balance_2019 = df["Balance at Beginning of Fiscal Year"]["April 27, 2019"]
balance_2018 = df["Balance at Beginning of Fiscal Year"]["April 28, 2018"]
answer = balance_2019 - balance_2018