What was the percentage change in Balance as of the beginning of the year in 2019 from 2018?
{"Balance as of the beginning of the year": {"2019": 65882, "2018": 47566, "2017": 20442}, "Increase related to acquisitions": {"2019": "\u2014", "2018": "\u2014", "2017": 25151}, "Tax positions related to current year: -- Additions": {"2019": 605, "2018": 19033, "2017": 1326}, "Tax positions related to current year: -- Reductions": {"2019": "\u2014", "2018": "\u2014", "2017": "\u2014"}, "Tax positions related to prior year: -- Additions": {"2019": 448, "2018": 117, "2017": 4951}, "Tax positions related to prior year: -- Reductions": {"2019": -6071, "2018": "\u2014", "2017": -65}, "Tax positions related to prior year: -- Lapses in statutes of limitations": {"2019": -639, "2018": -700, "2017": -610}, "Tax positions related to prior year: -- Decrease in unrecognized tax benefits based on audit results": {"2019": "\u2014", "2018": "\u2014", "2017": -5217}, "Tax positions related to prior year: -- Foreign currency revaluation adjustment": {"2019": -2114, "2018": -134, "2017": 1588}, "Tax positions related to prior year: -- Balance as of end of year": {"2019": 58111, "2018": 65882, "2017": 47566}}
balance_2019 = df["Balance as of the beginning of the year"]["2019"]
balance_2018 = df["Balance as of the beginning of the year"]["2018"]
answer = (balance_2019 - balance_2018) / balance_2018 * 100.0