What was the change in the balance at the beginning of the year between 2019 and 2020?
{"Balance, beginning of the year": {"January 31, 2020": 385, "February 1, 2019": 305, "February 2, 2018": 265}, "Tax positions related to current year: -- Additions": {"January 31, 2020": 116, "February 1, 2019": 57, "February 2, 2018": 63}, "Tax positions related to prior years: -- Additions": {"January 31, 2020": 98, "February 1, 2019": 44, "February 2, 2018": 2}, "Tax positions related to prior years: -- Reductions": {"January 31, 2020": -7, "February 1, 2019": -1, "February 2, 2018": -2}, "Tax positions related to prior years: -- Settlements": {"January 31, 2020": -28, "February 1, 2019": -4, "February 2, 2018": -9}, "Tax positions related to prior years: -- Reductions resulting from a lapse of the statute of limitations": {"January 31, 2020": -83, "February 1, 2019": -8, "February 2, 2018": -24}, "Tax positions related to prior years: -- Foreign currency effects": {"January 31, 2020": -2, "February 1, 2019": -8, "February 2, 2018": 10}, "Tax positions related to prior years: -- Balance, end of the year": {"January 31, 2020": 479, "February 1, 2019": 385, "February 2, 2018": 305}}
balance_january_31_2020 = df["Balance, beginning of the year"]["January 31, 2020"]
balance_february_1_2019 = df["Balance, beginning of the year"]["February 1, 2019"]
answer = balance_january_31_2020 - balance_february_1_2019