What is the percentage change in the beginning and ending balance of unrecognized tax benefits in 2019?
{"Beginning balance": {"2019": 63.6, "2018": 52.2, "2017": 38.7}, "Additions for tax positions of prior periods": {"2019": 2.9, "2018": 2.4, "2017": 24.8}, "Additions for tax positions of the current period": {"2019": 4.2, "2018": 6.9, "2017": 4.2}, "Additions due to acquisitions": {"2019": 1.9, "2018": 4.4, "2017": "\u2014"}, "Reductions for tax positions of prior periods": {"2019": -0.3, "2018": -0.4, "2017": -11.2}, "Reductions attributable to settlements with taxing authorities": {"2019": "\u2014", "2018": "\u2014", "2017": -1.5}, "Reductions attributable to lapses of applicable statute of limitations": {"2019": -2.5, "2018": -1.9, "2017": -2.8}, "Ending balance": {"2019": 69.8, "2018": 63.6, "2017": 52.2}}
ending_balance_2019 = df["Ending balance"]["2019"]
beginning_balance_2019 = df["Beginning balance"]["2019"]
answer = ( ending_balance_2019 - beginning_balance_2019 ) / beginning_balance_2019 * 100.0