What was the percentage change in the ending balance between 2018 and 2019?
{"Beginning balance": {"2019": 2801, "2018": 1973, "2017": 681}, "Additions based on tax positions of the current year": {"2019": 718, "2018": 857, "2017": 718}, "Additions based on tax positions of prior year": {"2019": 18, "2018": 147, "2017": 373}, "Decreases based on tax positions of prior year": {"2019": -253, "2018": "\u2014", "2017": "\u2014"}, "Additions resulting from acquisitions": {"2019": "\u2014", "2018": "\u2014", "2017": 277}, "Decreases due to lapse of applicable statute of limitations": {"2019": -219, "2018": -176, "2017": -76}, "Ending balance": {"2019": 3065, "2018": 2801, "2017": 1973}}
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