What was the change in the Balance at the end of the period in 2019 from 2018?
{"Balance at the beginning of the period": {"2019": 2720, "2018": 1342, "2017": 8531}, "Current period tax position increases": {"2019": "\u2014", "2018": 2950, "2017": "\u2014"}, "Decreases from settlements with tax authorities": {"2019": "\u2014", "2018": -191, "2017": -10865}, "Decreases due to lapse in applicable statute of limitations": {"2019": "\u2014", "2018": -1310, "2017": -466}, "Foreign currency translation increases (decreases)": {"2019": -9, "2018": -71, "2017": 4142}, "Balance at the end of the period": {"2019": 2711, "2018": 2720, "2017": 1342}}
balance_end_2019 = df["Balance at the end of the period"]["2019"]
balance_start_2019 = df["Balance at the beginning of the period"]["2019"]
answer = balance_end_2019 - balance_start_2019